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before the COPY attempt.
Example: C: A003 COPY 2:4 MEETING
S: A003 OK COPY completed
6.4.9. UID Command
Arguments: command name
command arguments
Data: untagged responses: FETCH, SEARCH
Result: OK - UID command completed
NO - UID command error
BAD - command unknown or arguments invalid
The UID command has two forms. In the first form, it takes as its
arguments a COPY, FETCH, or STORE command with arguments
appropriate for the associated command. However, the numbers in
the message set argument are unique identifiers instead of message
sequence numbers.
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In the second form, the UID command takes a SEARCH command with
SEARCH command arguments. The interpretation of the arguments is
the same as with SEARCH; however, the numbers returned in a SEARCH
response for a UID SEARCH command are unique identifiers instead
of message sequence numbers. For example, the command UID SEARCH
1:100 UID 443:557 returns the unique identifiers corresponding to
the intersection of the message sequence number set 1:100 and the
UID set 443:557.
A unique identifier of a message is a number, and is guaranteed
not to refer to any other message in the mailbox. Unique
identifiers are assigned in a strictly ascending fashion for each
message added to the mailbox. Unlike message sequence numbers,
unique identifiers persist across sessions. This permits a client
to resynchronize its state from a previous session with the server
(e.g. disconnected or offline access clients); this is discussed
further in [IMAP-DISC].
Associated with every mailbox is a unique identifier validity
value, which is sent in an UIDVALIDITY response code in an OK
untagged response at message selection time. If unique
identifiers from an earlier session fail to persist to this
session, the unique identifier validity value MUST be greater than
in the earlier session.
Note: An example of a good value to use for the unique
identifier validity value would be a 32-bit
representation of the creation date/time of the mailbox.
It is alright to use a constant such as 1, but only if
it guaranteed that unique identifers will never be
reused, even in the case of a mailbox being deleted and
a new mailbox by the same name created at some future
time.
Message set ranges are permitted; however, there is no guarantee
that unique identifiers be contiguous. A non-existent unique
identifier within a message set range is ignored without any error
message generated.
The number after the "*" in an untagged FETCH response is always a
message sequence number, not a unique identifier, even for a UID
command response. However, server implementations MUST implicitly
include the UID message data item as part of any FETCH response
caused by a UID command, regardless of whether UID was specified
as a message data item to the FETCH.
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Example: C: A003 UID FETCH 4827313:4828442 FLAGS
S: * 23 FETCH (FLAGS (Seen) UID 4827313)
S: * 24 FETCH (FLAGS (Seen) UID 4827943)
S: * 25 FETCH (FLAGS (Seen) UID 4828442)
S: A999 UID FETCH completed
6.5. Client Commands - Experimental/Expansion
6.5.1. X<atom> Command
Arguments: implementation defined
Data: implementation defined
Result: OK - command completed
NO - failure
BAD - command unknown or arguments invalid
Any command prefixed with an X is an experimental command.
Commands which are not part of this specification, or a standard
or standards-track revision of this specification, MUST use the X
prefix.
Any added untagged responses issued by an experimental command
MUST also be prefixed with an X. Server implementations MUST NOT
send any such untagged responses, unless the client requested it
by issuing the associated experimental command.
Example: C: a441 CAPABILITY
S: * CAPABILITY IMAP4 XPIG-LATIN
S: a441 OK CAPABILITY completed
C: A442 XPIG-LATIN
S: * XPIG-LATIN ow-nay eaking-spay ig-pay atin-lay
S: A442 OK XPIG-LATIN ompleted-cay
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7. Server Responses
Server responses are in three forms: status responses, server data,
and command continuation request.
Server response data, identified by "Data:" in the response
descriptions below, are described by function, not by syntax. The
precise syntax of server response data is described in the Formal
Syntax section.
The client MUST be prepared to accept any response at all times.
Status responses that are tagged indicate the completion result of a
client command, and have a tag matching the command.
Some status responses, and all server data, are untagged. An
untagged response is indicated by the token "*" instead of a tag.
Untagged status responses indicate server greeting, or server status
that does not indicate the completion of a command. For historical
reasons, untagged server data responses are also called "unsolicited
data", although strictly speaking only unilateral server data is
truly "unsolicited".
Certain server data MUST be recorded by the client when it is
received; this is noted in the description of that data. Such data
conveys critical information which affects the interpretation of all
subsequent commands and responses (e.g. updates reflecting the
creation or destruction of messags).
Other server data SHOULD be recorded for later reference; if the
client does not need to record the data, or if recording the data has
no obvious purpose (e.g. a SEARCH response when no SEARCH command is
in progress), the data SHOULD be ignored.
An example of unilateral untagged responses occurs when the IMAP
connection is in selected state. In selected state, the server
checks the mailbox for new messages as part of the execution of each
command. If new messages are found, the server sends untagged EXISTS
and RECENT responses reflecting the new size of the mailbox. Server
implementations that offer multiple simultaneous access to the same
mailbox should also send appropriate unilateral untagged FETCH and
EXPUNGE responses if another agent changes the state of any message
flags or expunges any messages.
Command continuation request responses use the token "+" instead of a
tag. These responses are sent by the server to indicate acceptance
of an incomplete client command and readiness for the remainder of
the command.
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7.1. Server Responses - Status Responses
Status responses may include an optional response code. A response
code consists of data inside square brackets in the form of an atom,
possibly followed by a space and arguments. The response code
contains additional information or status codes for client software
beyond the OK/NO/BAD condition, and are defined when there is a
specific action that a client can take based upon the additional
information.
The currently defined response codes are:
ALERT The human-readable text contains a special alert
that MUST be presented to the user in a fashion
that calls the user's attention to the message.
PARSE The human-readable text represents an error in
parsing the [RFC-822] or [MIME-1] headers of a
message in the mailbox.
PERMANENTFLAGS Followed by a parenthesized list of flags,
indicates which of the known flags that the client
may change permanently. Any flags that are in the
FLAGS untagged response, but not the PERMANENTFLAGS
list, can not be set permanently. If the client
attempts to STORE a flag that is not in the
PERMANENTFLAGS list, the server will either reject
it with a NO reply or store the state for the
remainder of the current session only. The
PERMANENTFLAGS list may also include the special
flag *, which indicates that it is possible to
create new keywords by attempting to store those
flags in the mailbox.
READ-ONLY The mailbox is selected read-only, or its access
while selected has changed from read-write to
read-only.
READ-WRITE The mailbox is selected read-write, or its access
while selected has changed from read-only to
read-write.
TRYCREATE An APPEND or COPY attempt is failing because the
target mailbox does not exist (as opposed to some
other reason). This is a hint to the client that
the operation may succeed if the mailbox is first
created by the CREATE command.
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UIDVALIDITY Followed by a decimal number, indicates the unique
identifier validity value. See the description of
the UID command for more detail.
UNSEEN Followed by a decimal number, indicates the number
of the first message without the Seen flag set.
Additional response codes defined by particular client or server
implementations should be prefixed with an "X" until they are
added to a revision of this protocol. Client implementations
should ignore response codes that they do not recognize.
7.1.1. OK Response
Data: optional response code
human-readable text
The OK response indicates an information message from the server.
When tagged, it indicates successful completion of the associated
command. The human-readable text may be presented to the user as
an information message. The untagged form indicates an
information-only message; the nature of the information may be
indicated by a response code.
The untagged form is also used as one of three possible greetings
at session startup. It indicates that the session is not yet
authenticated and that a LOGIN command is needed.
Example: S: * OK IMAP4 server ready
C: A001 LOGIN fred blurdybloop
S: * OK [ALERT] System shutdown in 10 minutes
S: A001 OK LOGIN Completed
7.1.2. NO Response
Data: optional response code
human-readable text
The NO response indicates an operational error message from the
server. When tagged, it indicates unsuccessful completion of the
associated command. The untagged form indicates a warning; the
command may still complete successfully. The human-readable text
describes the condition.
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Example: C: A222 COPY 1:2 owatagusiam
S: * NO Disk is 98% full, please delete unnecessary data
S: A222 OK COPY completed
C: A222 COPY 3:200 blurdybloop
S: * NO Disk is 98% full, please delete unnecessary data
S: * NO Disk is 99% full, please delete unnecessary data
S: A222 NO COPY failed: disk is full
7.1.3. BAD Response
Data: optional response code
human-readable text
The BAD response indicates an error message from the server. When
tagged, it reports a protocol-level error in the client's command;
the tag indicates the command that caused the error. The untagged
form indicates a protocol-level error for which the associated
command can not be determined; it may also indicate an internal
server failure. The human-readable text describes the condition.
Example: C: ...very long command line...
S: * BAD Command line too long
C: ...empty line...
S: * BAD Empty command line
C: A443 EXPUNGE
S: * BAD Disk crash, attempting salvage to a new disk!
S: * OK Salvage successful, no data lost
S: A443 OK Expunge completed
7.1.4. PREAUTH Response
Data: optional response code
human-readable text
The PREAUTH response is always untagged, and is one of three
possible greetings at session startup. It indicates that the
session has already been authenticated by external means and thus
no LOGIN command is needed.
Example: S: * PREAUTH IMAP4 server ready and logged in as Smith
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7.1.5. BYE Response
Data: optional response code
human-readable text
The BYE response is always untagged, and indicates that the server
is about to close the connection. The human-readable text may be
displayed to the user in a status report by the client. The BYE
response may be sent as part of a normal logout sequence, or as a
panic shutdown announcement by the server. It is also used by
some server implementations as an announcement of an inactivity
autologout.
This response is also used as one of three possible greetings at
session startup. It indicates that the server is not willing to
accept a session from this client.
Example: S: * BYE Autologout; idle for too long
7.2. Server Responses - Server and Mailbox Status
These responses are always untagged. This is how server data are
transmitted from the server to the client, often as a result of a
command with the same name.
7.2.1. CAPABILITY Response
Data: capability listing
The CAPABILITY response occurs as a result of a CAPABILITY
command. The capability listing contains a space-separated
listing of capability names that the server supports. The first
name in the capability listing MUST be the atom "IMAP4".
A capability name other than IMAP4 indicates that the server
supports an extension, revision, or amendment to the IMAP4
protocol. Server responses MUST conform to this document until
the client issues a command that uses the associated capability.
Capability names MUST either begin with "X" or be standard or
standards-track IMAP4 extensions, revisions, or amendments
registered with IANA. A server MUST NOT offer unregistered or
non-standard capability names, unless such names are prefixed with
an "X".
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Client implementations SHOULD NOT require any capability name
other than "IMAP4", and MUST ignore any unknown capability names.
Example: S: * CAPABILITY IMAP4 XPIG-LATIN
7.2.2. LIST Response
Data: name attributes
hierarchy delimiter
name
The LIST response occurs as a result of a LIST command. It
returns a single name that matches the LIST specification. There
may be multiple LIST responses for a single LIST command.
Four name attributes are defined:
Noinferiors It is not possible for any child levels of
hierarchy to exist under this name; no child levels
exist now and none can be created in the future.
Noselect It is not possible to use this name as a selectable
mailbox.
Marked The mailbox has been marked "interesting" by the
server; the mailbox probably contains messages that
have been added since the last time the mailbox was
selected.
Unmarked The mailbox does not contain any additional
messages since the last time the mailbox was
selected.
If it is not feasible for the server to determine whether the
mailbox is "interesting" or not, or if the name is a Noselect
name, the server should not send either Marked or Unmarked.
The hierarchy delimiter is a character used to delimit levels of
hierarchy in a mailbox name. A client may use it to create child
mailboxes, and to search higher or lower levels of naming
hierarchy. All children of a top-level hierarchy node must use
the same separator character. A NIL hierarchy delimiter means
that no hierarchy exists; the name is a "flat" name.
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The name represents an unambiguous left-to-right hierarchy, and
MUST be valid for use as a reference in LIST and LSUB commands.
Unless Noselect is indicated, the name must also be valid as an
argument for commands, such as SELECT, that accept mailbox names.
Example: S: * LIST (Noselect) "/" ~/Mail/foo
7.2.3. LSUB Response
Data: name attributes
hierarchy delimiter
name
The LSUB response occurs as a result of an LSUB command. It
returns a single name that matches the LSUB specification. There
may be multiple LSUB responses for a single LSUB command. The
data is identical in format to the LIST response.
Example: S: * LSUB () "." #news.comp.mail.misc
7.2.4. SEARCH Response
Data: zero or more numbers
The SEARCH response occurs as a result of a SEARCH or UID SEARCH
command. The number(s) refer to those messages that match the
search criteria. For SEARCH, these are message sequence numbers;
for UID SEARCH, these are unique identifiers. Each number is
delimited by a space.
Example: S: * SEARCH 2 3 6
7.2.5. FLAGS Response
Data: flag parenthesized list
The FLAGS response occurs as a result of a SELECT or EXAMINE
command. The flag parenthesized list identifies the flags (at a
minimum, the system-defined flags) that are applicable for this
mailbox. Flags other than the system flags may also exist,
depending on server implementation.
The update from the FLAGS response MUST be recorded by the client.
Example: S: * FLAGS (Answered Flagged Deleted Seen Draft)
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7.3. Server Responses - Message Status
These responses are always untagged. This is how message data are
transmitted from the server to the client, often as a result of a
command with the same name. Immediately following the "*" token is a
number that represents either a message sequence number or a message
count.
7.3.1. EXISTS Response
Data: none
The EXISTS response reports the number of messages in the mailbox.
This response occurs as a result of a SELECT or EXAMINE command,
and if the size of the mailbox changes (e.g. new mail).
The update from the EXISTS response MUST be recorded by the
client.
Example: S: * 23 EXISTS
7.3.2. RECENT Response
Data: none
The RECENT response reports the number of messages that have
arrived since the previous time a SELECT command was done on this
mailbox. This response occurs as a result of a SELECT or EXAMINE
command, and if the size of the mailbox changes (e.g. new mail).
The update from the RECENT response MUST be recorded by the
client.
Example: S: * 5 RECENT
7.3.3. EXPUNGE Response
Data: none
The EXPUNGE response reports that the specified message sequence
number has been permanently removed from the mailbox. The message
sequence number for each successive message in the mailbox is
immediately decremented by 1, and this decrement is reflected in
message sequence numbers in subsequent responses (including other
untagged EXPUNGE responses).
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As a result of the immediate decrement rule, message sequence
numbers that appear in a set of successive EXPUNGE responses
depend upon whether the messages are removed starting from lower
numbers to higher numbers, or from higher numbers to lower
numbers. For example, if the last 5 messages in a 9-message
mailbox are expunged; a "lower to higher" server will send five
untagged EXPUNGE responses for message sequence number 5, whereas
a "higher to lower server" will send successive untagged EXPUNGE
responses for message sequence numbers 9, 8, 7, 6, and 5.
An EXPUNGE response MUST NOT be sent when no command is in
progress; nor while responding to a FETCH, STORE, or SEARCH
command. This rule is necessary to prevent a loss of
synchronization of message sequence numbers between client and
server.
The update from the EXPUNGE response MUST be recorded by the
client.
Example: S: * 44 EXPUNGE
7.3.4. FETCH Response
Data: message data
The FETCH response returns data about a message to the client.
The data are pairs of data item names and their values in
parentheses. This response occurs as the result of a FETCH or
STORE command, as well as by unilateral server decision (e.g. flag
updates).
The current data items are:
BODY A form of BODYSTRUCTURE without extension data.
BODY[section] A string expressing the body contents of the
specified section. The string should be
interpreted by the client according to the content
transfer encoding, body type, and subtype.
8-bit textual data is permitted if a character set
identifier is part of the body parameter
parenthesized list for this section.
Non-textual data such as binary data must be
transfer encoded into a textual form such as BASE64
prior to being sent to the client. To derive the
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original binary data, the client must decode the
transfer encoded string.
BODYSTRUCTURE A parenthesized list that describes the body
structure of a message. This is computed by the
server by parsing the [RFC-822] header and body
into the component parts, defaulting various fields
as necessary.
Multiple parts are indicated by parenthesis
nesting. Instead of a body type as the first
element of the parenthesized list there is a nested
body. The second element of the parenthesized list
is the multipart subtype (mixed, digest, parallel,
alternative, etc.).
Extension data follows the multipart subtype.
Extension data is never returned with the BODY
fetch, but may be returned with a BODYSTRUCTURE
fetch. Extension data, if present, must be in the
defined order.
The extension data of a multipart body part are in
the following order:
body parameter parenthesized list
A parenthesized list of attribute/value pairs
[e.g. (foo bar baz rag) where "bar" is the value
of "foo" and "rag" is the value of "baz"] as
defined in [MIME-1].
Any following extension data are not yet defined in
this version of the protocol. Such extension data
may consist of zero or more NILs, strings, numbers,
or potentially nested parenthesized lists of such
data. Client implementations that do a
BODYSTRUCTURE fetch MUST be prepared to accept such
extension data. Server implementations MUST NOT
send such extension data until it has been defined
by a revision of this protocol.
The basic fields of a non-multipart body part are
in the following order:
body type
A string giving the content type name as defined
in [MIME-1].
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body subtype
A string giving the content subtype name as
defined in [MIME-1].
body parameter parenthesized list
A parenthesized list of attribute/value pairs
[e.g. (foo bar baz rag) where "bar" is the value
of "foo" and "rag" is the value of "baz"] as
defined in [MIME-1].
body id
A string giving the content id as defined in
[MIME-1].
body description
A string giving the content description as
defined in [MIME-1].
body encoding
A string giving the content transfer encoding as
defined in [MIME-1].
body size
A number giving the size of the body in octets.
Note that this size is the size in its transfer
encoding and not the resulting size after any
decoding.
A body type of type MESSAGE and subtype RFC822
contains, immediately after the basic fields, the
envelope structure, body structure, and size in
text lines of the encapsulated message.
A body type of type TEXT contains, immediately
after the basic fields, the size of the body in
text lines. Note that this size is the size in its
transfer encoding and not the resulting size after
any decoding.
Extension data follows the basic fields and the
type-specific fields listed above. Extension data
is never returned with the BODY fetch, but may be
returned with a BODYSTRUCTURE fetch. Extension
data, if present, must be in the defined order.
The extension data of a non-multipart body part are
in the following order:
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body MD5
A string giving the content MD5 value as defined
in [MIME-1].
Any following extension data are not yet defined in
this version of the protocol, and would be as
described above under multipart extension data.
ENVELOPE A parenthesized list that describes the envelope
structure of a message. This is computed by the
server by parsing the [RFC-822] header into the
component parts, defaulting various fields as
necessary.
The fields of the envelope structure are in the
following order: date, subject, from, sender,
reply-to, to, cc, bcc, in-reply-to, and message-id.
The date, subject, in-reply-to, and message-id
fields are strings. The from, sender, reply-to,
to, cc, and bcc fields are parenthesized lists of
address structures.
An address structure is a parenthesized list that
describes an electronic mail address. The fields
of an address structure are in the following order:
personal name, [SMTP] at-domain-list (source
route), mailbox name, and host name.
[RFC-822] group syntax is indicated by a special
form of address structure in which the host name
field is NIL. If the mailbox name field is also
NIL, this is an end of group marker (semi-colon in
RFC 822 syntax). If the mailbox name field is
non-NIL, this is a start of group marker, and the
mailbox name field holds the group name phrase.
Any field of an envelope or address structure that
is not applicable is presented as NIL. Note that
the server must default the reply-to and sender
fields from the from field; a client is not
expected to know to do this.
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FLAGS A parenthesized list of flags that are set for this
message. This may include keywords as well as the
following system flags:
Seen Message has been read
Answered Message has been answered
Flagged Message is "flagged" for urgent/special
attention
Deleted Message is "deleted" for removal by
later EXPUNGE
Draft Message has not completed composition
(marked as a draft).
as well as the following special flag, which may be
fetched but not stored:
Recent Message has arrived since the previous
time this mailbox was selected.
INTERNALDATE A string containing the date and time of final
delivery of the message as defined by [SMTP].
RFC822 A string expressing the message in [RFC-822]
format. The header portion of the message must be
7-bit. 8-bit characters are permitted only in the
non-header portion of the message only if there are
[MIME-1] data in the message that identify the
character set of the message.
RFC822.HEADER A string expressing the [RFC-822] format header of
the message, including the delimiting blank line
between the header and the body. The entire string
must be 7-bit; 8-bit characters are not permitted
in headers. RFC822.HEADER is used to return data
for the RFC822.HEADER, RFC822.HEADER.LINES, and
RFC822.HEADER.LINES.NOT FETCH data items. Note
that a blank line is always included regardless of
header line restrictions.
RFC822.SIZE A number expressing the number of octets in the
message in [RFC-822] format.
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RFC822.TEXT A string expressing the text body of the message,
omitting the [RFC-822] header. 8-bit characters
are permitted only if there are [MIME-1] data in
the message that identify the character set of the
message.
UID A number expressing the unique identifier of the
message.
Example: S: * 23 FETCH (FLAGS (Seen) RFC822.SIZE 44827)
7.3.5. Obsolete Responses
In addition to the responses listed in here, client implementations
MUST accept and implement the obsolete responses described in
Appendix B.
7.4. Server Responses - Command Continuation Request
The command completion request response is indicated by a "+" token
instead of a tag. This form of response indicates that the server is
ready to accept the continuation of a command from the client. The
remainder of this response is a line of text.
This response is used in the AUTHORIZATION command to transmit server
data to the client, and request additional client data. This
response is also used if an argument to any command is a literal.
The client is not permitted to send the octets of the literal unless
the server indicates that it expects it. This permits the server to
process commands and reject errors on a line-by-line basis. The
remainder of the command, including the CRLF that terminates a
command, follows the octets of the literal. If there are any
additional command arguments the literal octets are followed by a
space and those arguments.
Example: C: A001 LOGIN {11}
S: + Ready for additional command text
C: FRED FOOBAR {7}
S: + Ready for additional command text
C: fat man
S: A001 OK LOGIN completed
C: A044 BLURDYBLOOP {102856}
S: A044 BAD No such command as "BLURDYBLOOP"
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8. Sample IMAP4 session
The following is a transcript of an IMAP4 session. A long line in
this sample is broken for editorial clarity.
S: * OK IMAP4 Service Ready
C: a001 login mrc secret
S: a001 OK LOGIN completed
C: a002 select inbox
S: * 18 EXISTS
S: * FLAGS (Answered Flagged Deleted Seen Draft)
S: * 2 RECENT
S: * OK [UNSEEN 17] Message 17 is the first unseen message
S: * OK [UIDVALIDITY 3857529045] UIDs valid
S: a002 OK [READ-WRITE] SELECT completed
C: a003 fetch 12 full
S: * 12 FETCH (FLAGS (Seen) INTERNALDATE "14-Jul-1993 02:44:25 -0700"
RFC822.SIZE 4282 ENVELOPE ("Wed, 14 Jul 1993 02:23:25 -0700 (PDT)"
"IMAP4 WG mtg summary and minutes"
(("Terry Gray" NIL "gray" "cac.washington.edu"))
(("Terry Gray" NIL "gray" "cac.washington.edu"))
(("Terry Gray" NIL "gray" "cac.washington.edu"))
((NIL NIL "imap" "cac.washington.edu"))
((NIL NIL "minutes" "CNRI.Reston.VA.US")
("John Klensin" NIL "KLENSIN" "INFOODS.MIT.EDU")) NIL NIL
"<B27397-0100000@cac.washington.edu>")
BODY ("TEXT" "PLAIN" ("CHARSET" "US-ASCII") NIL NIL "7BIT" 3028 92))
S: a003 OK FETCH completed
C: a004 fetch 12 rfc822.header
S: * 12 FETCH (RFC822.HEADER {346}
S: Date: Wed, 14 Jul 1993 02:23:25 -0700 (PDT)
S: From: Terry Gray <gray@cac.washington.edu>
S: Subject: IMAP4 WG mtg summary and minutes
S: To: imap@cac.washington.edu
S: cc: minutes@CNRI.Reston.VA.US, John Klensin <KLENSIN@INFOODS.MIT.EDU>
S: Message-Id: <B27397-0100000@cac.washington.edu>
S: MIME-Version: 1.0
S: Content-Type: TEXT/PLAIN; CHARSET=US-ASCII
S:
S: )
S: a004 OK FETCH completed
C: a005 store 12 +flags deleted
S: * 12 FETCH (FLAGS (Seen Deleted))
S: a005 OK +FLAGS completed
C: a006 logout
S: * BYE IMAP4 server terminating connection
S: a006 OK LOGOUT completed
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RFC 1730 IMAP4 December 1994
9. Formal Syntax
The following syntax specification uses the augmented Backus-Naur
Form (BNF) notation as specified in [RFC-822] with one exception; the
delimiter used with the "#" construct is a single space (SPACE) and
not a comma.
Except as noted otherwise, all alphabetic characters are
case-insensitive. The use of upper or lower case characters to
define token strings is for editorial clarity only. Implementations
MUST accept these strings in a case-insensitive fashion.
Syntax marked as obsolete may be encountered with implementations
written for an earlier version of this protocol (e.g. IMAP2). New
implementations SHOULD accept obsolete syntax as input, but MUST NOT
otherwise use such syntax.
address ::= "(" addr_name SPACE addr_adl SPACE addr_mailbox
SPACE addr_host ")"
addr_adl ::= nstring
addr_host ::= nstring
;; NIL indicates [RFC-822] group syntax
addr_mailbox ::= nstring
;; NIL indicates end of [RFC-822] group; if
;; non-NIL and addr_host is NIL, holds
;; [RFC-822] group name
addr_name ::= nstring
alpha ::= "A" / "B" / "C" / "D" / "E" / "F" / "G" / "H" /
"I" / "J" / "K" / "L" / "M" / "N" / "O" / "P" /
"Q" / "R" / "S" / "T" / "U" / "V" / "W" / "X" /
"Y" / "Z" /
"a" / "b" / "c" / "d" / "e" / "f" / "g" / "h" /
"i" / "j" / "k" / "l" / "m" / "n" / "o" / "p" /
"q" / "r" / "s" / "t" / "u" / "v" / "w" / "x" /
"y" / "z" /
;; Case-sensitive
append ::= "APPEND" SPACE mailbox [SPACE flag_list]
[SPACE date_time] SPACE literal
astring ::= atom / string
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RFC 1730 IMAP4 December 1994
atom ::= 1*ATOM_CHAR
ATOM_CHAR ::= <any CHAR except atom_specials>
atom_specials ::= "(" / ")" / "{" / SPACE / CTLs / list_wildcards /
quoted_specials
authenticate ::= "AUTHENTICATE" SPACE auth_type *(CRLF base64)
auth_type ::= atom
base64 ::= *(4base64_char) [base64_terminal]
base64_char ::= alpha / digit / "+" / "/"
base64_terminal ::= (2base64_char "==") / (3base64_char "=")
body ::= "(" body_type_1part / body_type_mpart ")"
body_extension ::= nstring / number / "(" 1#body_extension ")"
;; Future expansion. Client implementations
;; MUST accept body_extension fields. Server
;; implementations MUST NOT generate
;; body_extension fields except as defined by
;; future standard or standards-track
;; revisions of this specification.
body_ext_1part ::= body_fld_md5 [SPACE 1#body_extension]
;; MUST NOT be returned on non-extensible
;; "BODY" fetch
body_ext_mpart ::= body_fld_param [SPACE 1#body_extension]]
;; MUST NOT be returned on non-extensible
;; "BODY" fetch
body_fields ::= body_fld_param SPACE body_fld_id SPACE
body_fld_desc SPACE body_fld_enc SPACE
body_fld_octets
body_fld_desc ::= nstring
body_fld_enc ::= (<"> ("7BIT" / "8BIT" / "BINARY" / "BASE64"/
"QUOTED-PRINTABLE") <">) / string
body_fld_id ::= nstring
body_fld_lines ::= number
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RFC 1730 IMAP4 December 1994
body_fld_md5 ::= nstring
body_fld_octets ::= number
body_fld_param ::= "(" 1#(string string) ")" / nil
body_fld_subtyp ::= string
body_type_1part ::= (body_type_basic / body_type_msg / body_type_text)
[SPACE body_ext_1part]
body_type_basic ::= (<"> ("APPLICATION" / "AUDIO" / "IMAGE" /
"MESSAGE" / "VIDEO") <">) / string) SPACE
body_fld_subtyp SPACE body_fields
;; MESSAGE subtype MUST NOT be "RFC822"
body_type_mpart ::= 1*body SPACE body_fld_subtyp
[SPACE body_ext_mpart]
body_type_msg ::= <"> "MESSAGE" <"> SPACE <"> "RFC822" <"> SPACE
body_fields SPACE envelope SPACE body SPACE
body_fld_lines
body_type_text ::= <"> "TEXT" <"> SPACE body_fld_subtyp SPACE
body_fields SPACE body_fld_lines
capability ::= atom
;; Must begin with "X" or be registered with
;; IANA as standard or standards-track
capability_data ::= "CAPABILITY" SPACE "IMAP4" [SPACE 1#capability]
CHAR ::= <any 7-bit US-ASCII character except NUL,
0x01 - 0x7f>
CHAR8 ::= <any 8-bit octet except NUL, 0x01 - 0xff>
command ::= tag SPACE (command_any / command_auth /
command_nonauth / command_select) CRLF
;; Modal based on state
command_any ::= "CAPABILITY" / "LOGOUT" / "NOOP" / x_command
;; Valid in all states
command_auth ::= append / create / delete / examine / find / list /
lsub / rename / select / subscribe / unsubscribe /
;; Valid only in Authenticated or Selected state
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RFC 1730 IMAP4 December 1994
command_nonauth ::= login / authenticate
;; Valid only when in Non-Authenticated state
command_select ::= "CHECK" / "CLOSE" / "EXPUNGE" /
copy / fetch / partial / store / uid / search
;; Valid only when in Selected state
continue_req ::= "+" SPACE (resp_text / base64)
copy ::= "COPY" SPACE set SPACE mailbox
CR ::= <ASCII CR, carriage return, 0x0C>
create ::= "CREATE" SPACE mailbox
;; Use of INBOX gives a NO error
CRLF ::= CR LF
CTL ::= <any ASCII control character and DEL,
0x00 - 0x1f, 0x7f>
date ::= date_text / <"> date_text <">
date_day ::= 1*2digit
;; Day of month
date_day_fixed ::= (SPACE digit) / 2digit
;; Fixed-format version of date_day
date_month ::= "Jan" / "Feb" / "Mar" / "Apr" / "May" / "Jun" /
"Jul" / "Aug" / "Sep" / "Oct" / "Nov" / "Dec"
date_text ::= date_day "-" date_month "-" (date_year /
date_year_old)
date_year ::= 4digit
date_year_old ::= 2digit
;; OBSOLETE, (year - 1900)
date_time ::= <"> (date_time_new / date_time_old) <">
date_time_new ::= date_day_fixed "-" date_month "-" date_year
SPACE time SPACE zone
date_time_old ::= date_day_fixed "-" date_month "-" date_year_old
SPACE time "-" zone_old
;; OBSOLETE
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RFC 1730 IMAP4 December 1994
delete ::= "DELETE" SPACE mailbox
;; Use of INBOX gives a NO error
digit ::= "0" / digit_nz
digit_nz ::= "1" / "2" / "3" / "4" / "5" / "6" / "7" / "8" /
"9"
envelope ::= "(" env_date SPACE env_subject SPACE env_from
SPACE env_sender SPACE env_reply-to SPACE env_to
SPACE env_cc SPACE env_bcc SPACE env_in-reply-to
SPACE env_message-id ")"
env_bcc ::= "(" 1*address ")" / nil
env_cc ::= "(" 1*address ")" / nil
env_date ::= nstring
env_from ::= "(" 1*address ")" / nil
env_in-reply-to ::= nstring
env_message-id ::= nstring
env_reply-to ::= "(" 1*address ")" / nil
env_sender ::= "(" 1*address ")" / nil
env_subject ::= nstring
env_to ::= "(" 1*address ")" / nil
examine ::= "EXAMINE" SPACE mailbox
fetch ::= "FETCH" SPACE set SPACE ("ALL" / "FULL" /
"FAST" / fetch_att / "(" 1#fetch_att ")")
fetch_att ::= "BODY" / "BODYSTRUCTURE" /
"BODY" [".PEEK"] "[" section "]" / "ENVELOPE" /
"FLAGS" / "INTERNALDATE" / "UID" /
"RFC822" (([".TEXT"] [".PEEK"]) / ".SIZE" /
(".HEADER" [".LINES" [".NOT"] SPACE header_list])
find ::= "FIND" SPACE ["ALL."] "MAILBOXES" SPACE
list_mailbox
;; OBSOLETE
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RFC 1730 IMAP4 December 1994
flag ::= "Answered" / "Flagged" / "Deleted" /
"Seen" / "Draft" / flag_keyword /
flag_extension
flag_extension ::= "" atom
;; Future expansion. Client implementations
;; MUST accept flag_extension flags. Server
;; implementations MUST NOT generate
;; flag_extension flags except as defined by
;; future standard or standards-track
;; revisions of this specification.
flag_keyword ::= atom
flag_list ::= "(" #flag ")"
greeting ::= "*" SPACE (resp_cond_auth / resp_cond_bye) CRLF
header_line ::= astring
header_list ::= "(" 1#header_line ")"
LF ::= <ASCII LF, line feed, 0x0A>
list ::= "LIST" SPACE mailbox SPACE list_mailbox
list_mailbox ::= 1*(ATOM_CHAR / list_wildcards) / string
list_wildcards ::= "%" / "*"
literal ::= "{" number "}" CRLF *CHAR8
;; Number represents the number of CHAR8 octets
login ::= "LOGIN" SPACE userid SPACE password
lsub ::= "LSUB" SPACE mailbox SPACE list_mailbox
mailbox ::= "INBOX" / astring
;; INBOX is case-insensitive; other names may be
;; case-sensitive depending on implementation.
mailbox_data ::= "FLAGS" SPACE flag_list /
"LIST" SPACE mailbox_list /
"LSUB" SPACE mailbox_list /
"MAILBOX" SPACE text /
"SEARCH" [SPACE 1#nz_number] /
number SPACE "EXISTS" / number SPACE "RECENT"
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RFC 1730 IMAP4 December 1994
mailbox_list ::= "(" #("Marked" / "Noinferiors" /
"Noselect" / "Unmarked" / flag_extension) ")"
SPACE (<"> QUOTED_CHAR <"> / nil) SPACE mailbox
message_data ::= nz_number SPACE ("EXPUNGE" /
("FETCH" SPACE msg_fetch) / msg_obsolete)
msg_fetch ::= "(" 1#("BODY" SPACE body /
"BODYSTRUCTURE" SPACE body /
"BODY[" section "]" SPACE nstring /
"ENVELOPE" SPACE envelope /
"FLAGS" SPACE "(" #(flag / "Recent") ")" /
"INTERNALDATE" SPACE date_time /
"RFC822" [".HEADER" / ".TEXT"] SPACE nstring /
"RFC822.SIZE" SPACE number /
"UID" SPACE uniqueid) ")"
msg_obsolete ::= "COPY" / ("STORE" SPACE msg_fetch)
;; OBSOLETE untagged data responses
nil ::= "NIL"
nstring ::= string / nil
number ::= 1*digit
;; Unsigned 32-bit integer
;; (0 <= n < 4,294,967,296)
nz_number ::= digit_nz *digit
;; Non-zero unsigned 32-bit integer
;; (0 < n < 4,294,967,296)
partial ::= "PARTIAL" SPACE nz_number SPACE
("BODY" [".PEEK"] "[" section "]" /
"RFC822" (([".TEXT"] [".PEEK"]) / ".HEADER")
SPACE number SPACE number
password ::= astring
quoted ::= <"> *QUOTED_CHAR <">
QUOTED_CHAR ::= <any TEXT_CHAR except quoted_specials> /
"" quoted_specials
quoted_specials ::= <"> / ""
rename ::= "RENAME" SPACE mailbox SPACE mailbox
;; Use of INBOX as a destination gives a NO error
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RFC 1730 IMAP4 December 1994
response ::= *response_data response_done
response_data ::= "*" SPACE (resp_cond_state / resp_cond_bye /
mailbox_data / message_data / capability_data)
CRLF
response_done ::= response_tagged / response_fatal
response_fatal ::= "*" SPACE resp_cond_bye CRLF
response_tagged ::= tag SPACE resp_cond_state CRLF
resp_cond_auth ::= ("OK" / "PREAUTH") SPACE resp_text
;; Authentication condition
resp_cond_bye ::= "BYE" SPACE resp_text
;; Server will disconnect condition
resp_cond_state ::= ("OK" / "NO" / "BAD") SPACE resp_text
;; Status condition
resp_text ::= ["[" resp_text_code "]" SPACE] (text_mime2 / text)
resp_text_code ::= "ALERT" / "PARSE" /
"PERMANENTFLAGS" SPACE "(" #(flag / "*") ")" /
"READ-ONLY" / "READ-WRITE" / "TRYCREATE" /
"UIDVALIDITY" SPACE nz_number /
"UNSEEN" SPACE nz_number /
atom [SPACE 1*<any TEXT_CHAR except "]">]
search ::= "SEARCH" SPACE ["CHARSET" SPACE astring SPACE]
search_criteria
;; Character set must be registered with IANA
;; as a MIME character set
search_criteria ::= 1#search_key
search_key ::= search_new / search_old
search_new ::= "DRAFT" /
"HEADER" SPACE header_line SPACE astring /
"LARGER" SPACE number / "NOT" SPACE search_key /
"OR" SPACE search_key SPACE search_key /
"SENTBEFORE" SPACE date / "SENTON" SPACE date /
"SENTSINCE" SPACE date / "SMALLER" SPACE number /
"UID" SPACE set / "UNDRAFT" / set /
"(" search_criteria ")"
;; New in IMAP4
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RFC 1730 IMAP4 December 1994
search_old ::= "ALL" / "ANSWERED" / "BCC" SPACE astring /
"BEFORE" SPACE date / "BODY" SPACE astring /
"CC" SPACE astring / "DELETED" / "FLAGGED" /
"FROM" SPACE astring /
"KEYWORD" SPACE flag_keyword / "NEW" / "OLD" /
"ON" SPACE date / "RECENT" / "SEEN" /
"SINCE" SPACE date / "SUBJECT" SPACE astring /
"TEXT" SPACE astring / "TO" SPACE astring /
"UNANSWERED" / "UNDELETED" / "UNFLAGGED" /
"UNKEYWORD" SPACE flag_keyword / "UNSEEN"
;; Defined in [IMAP2]
section ::= "0" / nz_number ["." section]
select ::= "SELECT" SPACE mailbox
sequence_num ::= nz_number / "*"
;; * is the largest number in use. For message
;; sequence numbers, it is the number of messages
;; in the mailbox. For unique identifiers, it is
;; the unique identifier of the last message in
;; the mailbox.
set ::= sequence_num / (sequence_num ":" sequence_num) /
(set "," set)
;; Identifies a set of messages. For message
;; sequence numbers, these are consecutive
;; numbers from 1 to the number of messages in
;; the mailbox
;; Comma delimits individual numbers, colon
;; delimits between two numbers inclusive.
;; Example: 2,4:7,9,12:* is 2,4,5,6,7,9,12,13,
;; 14,15 for a mailbox with 15 messages.
SPACE ::= <ASCII SP, space, 0x20>
store ::= "STORE" SPACE set SPACE store_att_flags
store_att_flags ::= (["+" / "-"] "FLAGS" [".SILENT"]) SPACE
(flag_list / #flag)
string ::= quoted / literal
subscribe ::= ("SUBSCRIBE" SPACE mailbox) / subscribe_obs
subscribe_obs ::= "SUBSCRIBE" SPACE "MAILBOX" SPACE mailbox
;;OBSOLETE
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RFC 1730 IMAP4 December 1994
tag ::= 1*<any ATOM_CHAR except "+">
text ::= 1*TEXT_CHAR
text_mime2 ::= "=?" <charset> "?" <encoding> "?"
<encoded-text> "?="
;; Syntax defined in [MIME-2]
TEXT_CHAR ::= <any CHAR except CR and LF>
time ::= 2digit ":" 2digit ":" 2digit
;; Hours minutes seconds
uid ::= "UID" SPACE (copy / fetch / search / store)
;; Unique identifiers used instead of message
;; sequence numbers
uniqueid ::= nz_number
;; Strictly ascending
unsubscribe ::= ("UNSUBSCRIBE" SPACE mailbox) / unsubscribe_obs
unsubscribe_obs ::= "UNSUBSCRIBE" SPACE "MAILBOX" SPACE mailbox
;;OBSOLETE
userid ::= astring
x_command ::= "X" atom <experimental command arguments>
zone ::= ("+" / "-") 4digit
;; Signed four-digit value of hhmm representing
;; hours and minutes west of Greenwich (that is,
;; (the amount that the given time differs from
;; Universal Time). Subtracting the timezone
;; from the given time will give the UT form.
;; The Universal Time zone is "+0000".
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RFC 1730 IMAP4 December 1994
zone_old ::= "UT" / "GMT" / "Z" / ;; +0000
"AST" / "EDT" / ;; -0400
"EST" / "CDT" / ;; -0500
"CST" / "MDT" / ;; -0600
"MST" / "PDT" / ;; -0700
"PST" / "YDT" / ;; -0800
"YST" / "HDT" / ;; -0900
"HST" / "BDT" / ;; -1000
"BST" / ;; -1100
"A" / "B" / "C" / "D" / "E" / "F" / ;; +1 to +6
"G" / "H" / "I" / "K" / "L" / "M" / ;; +7 to +12
"N" / "O" / "P" / "Q" / "R" / "S" / ;; -1 to -6
"T" / "U" / "V" / "W" / "X" / "Y" ;; -7 to -12
;; OBSOLETE
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RFC 1730 IMAP4 December 1994
10. Author's Note
This document is a revision or rewrite of earlier documents, and
supercedes the protocol specification in those documents: IMAP4
Internet drafts, the IMAP2bis Internet drafts, unpublished
IMAP2bis.TXT document, RFC 1176, and RFC 1064.
11. Security Considerations
IMAP4 protocol transactions, including electronic mail data, are sent
in the clear over the network unless the optional privacy protection
is negotiated in the AUTHENTICATE command.
A server error message for an AUTHENTICATE command which fails due to
invalid credentials should not detail why the credentials are
invalid.
Use of the LOGIN command sends passwords in the clear. This can be
avoided by using the AUTHENTICATE command instead.
A server error message for a failing LOGIN command should not specify
that the user name, as opposed to the password, is invalid.
Additional security considerations are discussed in the section
discussing the AUTHENTICATE and LOGIN commands.
12. Author's Address
Mark R. Crispin
Networks and Distributed Computing, JE-30
University of Washington
Seattle, WA 98195
Phone: (206) 543-5762
EMail: MRC@CAC.Washington.EDU
Crispin [Page 64]
RFC 1730 IMAP4 December 1994
Appendices
A. Obsolete Commands
The following commands are OBSOLETE. It is NOT required to support
any of these commands in new server implementations. These commands
are documented here for the benefit of implementors who may wish to
support them for compatibility with old client implementations.
The section headings of these commands are intended to correspond
with where they would be located in the main document if they were
not obsoleted.
A.6.3.OBS.1. FIND ALL.MAILBOXES Command
Arguments: mailbox name with possible wildcards
Data: untagged responses: MAILBOX
Result: OK - find completed
NO - find failure: can't list that name
BAD - command unknown or arguments invalid
The FIND ALL.MAILBOXES command returns a subset of names from the
complete set of all names available to the user. It returns zero
or more untagged MAILBOX replies. The mailbox argument to FIND
ALL.MAILBOXES is similar to that for LIST with an empty reference,
except that the characters "%" and "?" match a single character.
Example: C: A002 FIND ALL.MAILBOXES *
S: * MAILBOX blurdybloop
S: * MAILBOX INBOX
S: A002 OK FIND ALL.MAILBOXES completed
A.6.3.OBS.2. FIND MAILBOXES Command
Arguments: mailbox name with possible wildcards
Data: untagged responses: MAILBOX
Result: OK - find completed
NO - find failure: can't list that name
BAD - command unknown or arguments invalid
The FIND MAILBOXES command returns a subset of names from the set
of names that the user has declared as being "active" or
Crispin [Page 65]
RFC 1730 IMAP4 December 1994
"subscribed". It returns zero or more untagged MAILBOX replies.
The mailbox argument to FIND MAILBOXES is similar to that for LSUB
with an empty reference, except that the characters "%" and "?"
match a single character.
Example: C: A002 FIND MAILBOXES *
S: * MAILBOX blurdybloop
S: * MAILBOX INBOX
S: A002 OK FIND MAILBOXES completed
A.6.3.OBS.3. SUBSCRIBE MAILBOX Command
Arguments: mailbox name
Data: no specific data for this command
Result: OK - subscribe completed
NO - subscribe failure: can't subscribe to that name
BAD - command unknown or arguments invalid
The SUBSCRIBE MAILBOX command is identical in effect to the
SUBSCRIBE command. A server which implements this command must be
able to distinguish between a SUBSCRIBE MAILBOX command and a
SUBSCRIBE command with a mailbox name argument of "MAILBOX".
Example: C: A002 SUBSCRIBE MAILBOX #news.comp.mail.mime
S: A002 OK SUBSCRIBE MAILBOX to #news.comp.mail.mime
completed
C: A003 SUBSCRIBE MAILBOX
S: A003 OK SUBSCRIBE to MAILBOX completed
A.6.3.OBS.4. UNSUBSCRIBE MAILBOX Command
Arguments: mailbox name
Data: no specific data for this command
Result: OK - unsubscribe completed
NO - unsubscribe failure: can't unsubscribe that name
BAD - command unknown or arguments invalid
The UNSUBSCRIBE MAILBOX command is identical in effect to the
UNSUBSCRIBE command. A server which implements this command must
be able to distinguish between a UNSUBSCRIBE MAILBOX command and
an UNSUBSCRIBE command with a mailbox name argument of "MAILBOX".
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RFC 1730 IMAP4 December 1994
Example: C: A002 UNSUBSCRIBE MAILBOX #news.comp.mail.mime
S: A002 OK UNSUBSCRIBE MAILBOX from #news.comp.mail.mime
completed
C: A003 UNSUBSCRIBE MAILBOX
S: A003 OK UNSUBSCRIBE from MAILBOX completed
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RFC 1730 IMAP4 December 1994
B. Obsolete Responses
The following responses are OBSOLETE. Except as noted below, these
responses MUST NOT be transmitted by new server implementations.
The section headings of these responses are intended to correspond
with where they would be located in the main document if they were
not obsoleted.
B.7.2.OBS.1. MAILBOX Response
Data: name
The MAILBOX response MUST NOT be transmitted by server
implementations except in response to the obsolete FIND MAILBOXES
and FIND ALL.MAILBOXES commands. Client implementations that do
not use these commands MAY ignore this response. It is documented
here for the benefit of implementors who may wish to support it
for compatibility with old client implementations.
This response occurs as a result of the FIND MAILBOXES and FIND
ALL.MAILBOXES commands. It returns a single name that matches the
FIND specification. There are no attributes or hierarchy
delimiter.
Example: S: * MAILBOX blurdybloop
B.7.3.OBS.1. COPY Response
Data: none
The COPY response MUST NOT be transmitted by new server
implementations. Client implementations MUST ignore the COPY
response. It is documented here for the benefit of client
implementors who may encounter this response from old server
implementations.
In some experimental versions of this protocol, this response was
returned in response to a COPY command to indicate on a
per-message basis that the message was copied successfully.
Example: S: * 44 COPY
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RFC 1730 IMAP4 December 1994
B.7.3.OBS.2. STORE Response
Data: message data
The STORE response MUST NOT be transmitted by new server
implementations. Client implementations MUST treat the STORE
response as equivalent to the FETCH response. It is documented
here for the benefit of client implementors who may encounter this
response from old server implementations.
In some experimental versions of this protocol, this response was
returned instead of FETCH in response to a STORE command to report
the new value of the flags.
Example: S: * 69 STORE (FLAGS (Deleted))
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RFC 1730 IMAP4 December 1994
C. References
[IMAP-AUTH] Myers, J., "IMAP4 Authentication Mechanism", RFC 1731.
Carnegie-Mellon University, December 1994.
[IMAP-COMPAT] Crispin, M. "IMAP4 Compatibility with IMAP2 and
IMAP2bis", RFC 1732, University of Washington, December 1994.
[IMAP-DISC] Austein, R. "Synchronization Operations for Disconnected
IMAP4 Clients", Work in Progress.
[IMAP-MODEL] Crispin, M. "Distributed Electronic Mail Models in
IMAP4", RFC 1733, University of Washington, December 1994.
[IMAP-NAMING] Crispin, M. "Mailbox Naming Convention in IMAP4", Work
in Progress.
[IMAP2] Crispin, M., "Interactive Mail Access Protocol - Version 2",
RFC 1176, University of Washington, August 1990.
[IMSP] Myers, J. "IMSP -- Internet Message Support Protocol", Work in
Progress.
[MIME-1] Borenstein, N., and Freed, N., "MIME (Multipurpose Internet
Mail Extensions) Part One: Mechanisms for Specifying and Describing
the Format of Internet Message Bodies", RFC 1521, Bellcore, Innosoft,
September 1993.
[MIME-2] Moore, K., "MIME (Multipurpose Internet Mail Extensions)
Part Two: Message Header Extensions for Non-ASCII Text", RFC 1522,
University of Tennessee, September 1993.
[RFC-822] Crocker, D., "Standard for the Format of ARPA Internet Text
Messages", STD 11, RFC 822, University of Delaware, August 1982.
[SMTP] Postel, Jonathan B. "Simple Mail Transfer Protocol", STD 10,
RFC 821, USC/Information Sciences Institute, August 1982.
Crispin [Page 70]
RFC 1730 IMAP4 December 1994
E. IMAP4 Keyword Index
+FLAGS <flag list> (store command data item) ............... 34
+FLAGS.SILENT <flag list> (store command data item) ........ 34
-FLAGS <flag list> (store command data item) ............... 34
-FLAGS.SILENT <flag list> (store command data item) ........ 34
ALERT (response code) ...................................... 39
ALL (fetch item) ........................................... 29
ALL (search key) ........................................... 27
ANSWERED (search key) ...................................... 27
APPEND (command) ........................................... 22
AUTHENTICATE (command) ..................................... 12
BAD (response) ............................................. 41
BCC <string> (search key) .................................. 27
BEFORE <date> (search key) ................................. 27
BODY (fetch item) .......................................... 29
BODY (fetch result) ........................................ 46
BODY <string> (search key) ................................. 27
BODY.PEEK[<section>] (fetch item) .......................... 30
BODYSTRUCTURE (fetch item) ................................. 31
BODYSTRUCTURE (fetch result) ............................... 47
BODY[<section>] (fetch item) ............................... 29
BODY[section] (fetch result) ............................... 46
BYE (response) ............................................. 41
CAPABILITY (command) ....................................... 10
CAPABILITY (response) ...................................... 42
CC <string> (search key) ................................... 27
CHECK (command) ............................................ 23
CLOSE (command) ............................................ 24
COPY (command) ............................................. 34
COPY (response) ............................................ 68
CREATE (command) ........................................... 17
DELETE (command) ........................................... 18
DELETED (search key) ....................................... 27
DRAFT (search key) ......................................... 27
ENVELOPE (fetch item) ...................................... 31
ENVELOPE (fetch result) .................................... 49
EXAMINE (command) .......................................... 16
EXISTS (response) .......................................... 45
EXPUNGE (command) .......................................... 25
EXPUNGE (response) ......................................... 45
FAST (fetch item) .......................................... 31
FETCH (command) ............................................ 29
FETCH (response) ........................................... 46
FIND ALL.MAILBOXES (command) ............................... 65
FIND MAILBOXES (command) ................................... 65
FLAGGED (search key) ....................................... 27
FLAGS (fetch item) ......................................... 31
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RFC 1730 IMAP4 December 1994
FLAGS (fetch result) ....................................... 50
FLAGS (response) ........................................... 44
FLAGS <flag list> (store command data item) ................ 34
FLAGS.SILENT <flag list> (store command data item) ......... 34
FROM <string> (search key) ................................. 27
FULL (fetch item) .......................................... 31
HEADER <field-name> <string> (search key) .................. 27
INTERNALDATE (fetch item) .................................. 31
INTERNALDATE (fetch result) ................................ 50
KEYWORD <flag> (search key) ................................ 27
LARGER <n> (search key) .................................... 27
LIST (command) ............................................. 20
LIST (response) ............................................ 43
LOGIN (command) ............................................ 14
LOGOUT (command) ........................................... 11
LSUB (command) ............................................. 22
LSUB (response) ............................................ 44
MAILBOX (response) ......................................... 68
NEW (search key) ........................................... 27
NO (response) .............................................. 40
NOOP (command) ............................................. 11
NOT <search-key> (search key) .............................. 28
OK (response) .............................................. 40
OLD (search key) ........................................... 28
ON <date> (search key) ..................................... 28
OR <search-key1> <search-key2> (search key) ................ 28
PARSE (response code) ...................................... 39
PARTIAL (command) .......................................... 32
PERMANENTFLAGS (response code) ............................. 39
PREAUTH (response) ......................................... 41
READ-ONLY (response code) .................................. 39
READ-WRITE (response code) ................................. 39
RECENT (response) .......................................... 45
RECENT (search key) ........................................ 28
RENAME (command) ........................................... 18
RFC822 (fetch item) ........................................ 31
RFC822 (fetch result) ...................................... 50
RFC822.HEADER (fetch item) ................................. 31
RFC822.HEADER (fetch result) ............................... 50
RFC822.HEADER.LINES <header_list> (fetch item) ............. 31
RFC822.HEADER.LINES.NOT <header_list> (fetch item) ......... 32
RFC822.PEEK (fetch item) ................................... 31
RFC822.SIZE (fetch item) ................................... 32
RFC822.SIZE (fetch result) ................................. 50
RFC822.TEXT (fetch item) ................................... 32
RFC822.TEXT (fetch result) ................................. 51
RFC822.TEXT.PEEK (fetch item) .............................. 32
SEARCH (command) ........................................... 25
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RFC 1730 IMAP4 December 1994
SEARCH (response) .......................................... 44
SEEN (search key) .......................................... 28
SELECT (command) ........................................... 15
SENTBEFORE <date> (search key) ............................. 28
SENTON <date> (search key) ................................. 28
SENTSINCE <date> (search key) .............................. 28
SINCE <date> (search key) .................................. 28
SMALLER <n> (search key) ................................... 28
STORE (command) ............................................ 33
STORE (response) ........................................... 69
SUBJECT <string> (search key) .............................. 28
SUBSCRIBE (command) ........................................ 19
SUBSCRIBE MAILBOX (command) ................................ 66
TEXT <string> (search key) ................................. 28
TO <string> (search key) ................................... 28
TRYCREATE (response code) .................................. 39
UID (command) .............................................. 35
UID (fetch item) ........................................... 32
UID (fetch result) ......................................... 51
UID <message set> (search key) ............................. 28
UIDVALIDITY (response code) ................................ 40
UNANSWERED (search key) .................................... 29
UNDELETED (search key) ..................................... 29
UNDRAFT (search key) ....................................... 29
UNFLAGGED (search key) ..................................... 29
UNKEYWORD <flag> (search key) .............................. 29
UNSEEN (response code) ..................................... 40
UNSEEN (search key) ........................................ 29
UNSUBSCRIBE (command) ...................................... 19
UNSUBSCRIBE MAILBOX (command) .............................. 66
X<atom> (command) .......................................... 37
Answered (system flag) .................................... 50
Deleted (system flag) ..................................... 50
Draft (system flag) ....................................... 50
Flagged (system flag) ..................................... 50
Marked (mailbox name attribute) ........................... 43
Noinferiors (mailbox name attribute) ...................... 43
Noselect (mailbox name attribute) ......................... 43
Recent (system flag) ...................................... 50
Seen (system flag) ........................................ 50
Unmarked (mailbox name attribute) ......................... 43
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