Internet Message Access Protocol (IMAP) Capabilities Registry

Last Updated
2014-03-03
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Registry included below

IMAP Capabilities

Registration Procedure(s)
Standards track or IESG-approved experimental RFC
Reference
[RFC3501]
Note
Capability names MUST either begin with "X" or be standard or
standards-track IMAP4rev1 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".

Client implementations SHOULD NOT require any capability name other
than "IMAP4rev1", and MUST ignore any unknown capability names.
Available Formats

CSV
Capability Name Reference
ACL [RFC4314]
ANNOTATE-EXPERIMENT-1 [RFC5257]
BINARY [RFC3516]
CATENATE [RFC4469]
CHILDREN [RFC3348]
COMPRESS=DEFLATE [RFC4978]
CONDSTORE [RFC-ietf-qresync-rfc5162bis-10]
CONTEXT=SEARCH [RFC5267]
CONTEXT=SORT [RFC5267]
CONVERT [RFC5259]
CREATE-SPECIAL-USE [RFC6154]
ENABLE [RFC5161]
ESEARCH [RFC4731]
ESORT [RFC5267]
FILTERS [RFC5466]
I18NLEVEL=1 [RFC5255]
I18NLEVEL=2 [RFC5255]
ID [RFC2971]
IDLE [RFC2177]
IMAPSIEVE= [RFC-ietf-sieve-imap-sieve-09]
LANGUAGE [RFC5255]
LIST-STATUS [RFC5819]
LITERAL+ [RFC2088]
LOGIN-REFERRALS [RFC2221]
LOGINDISABLED [RFC2595][RFC3501]
MAILBOX-REFERRALS [RFC2193]
MOVE [RFC6851]
MULTIAPPEND [RFC3502]
MULTISEARCH [RFC6237]
NAMESPACE [RFC2342]
NOTIFY [RFC5465]
QRESYNC [RFC-ietf-qresync-rfc5162bis-10]
QUOTA [RFC2087]
RIGHTS= [RFC4314]
SASL-IR [RFC4959]
SEARCH=FUZZY [RFC6203]
SEARCHRES [RFC5182]
SORT [RFC5256]
SORT=DISPLAY [RFC5957]
SPECIAL-USE [RFC6154]
STARTTLS [RFC2595][RFC3501]
THREAD [RFC5256]
UIDPLUS [RFC4315]
UNSELECT [RFC3691]
URLFETCH=BINARY [RFC5524]
URL-PARTIAL [RFC5550]
URLAUTH [RFC4467]
UTF8=ACCEPT [RFC6855]
UTF8=ALL (OBSOLETE) [RFC5738][RFC6855]
UTF8=APPEND (OBSOLETE) [RFC5738][RFC6855]
UTF8=ONLY [RFC6855]
UTF8=USER (OBSOLETE) [RFC5738][RFC6855]
WITHIN [RFC5032]