Internet Message Access Protocol (IMAP) Capabilities Registry

   Last Updated
           2021-03-09

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   Registry included below

     * IMAP Capabilities

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.

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      Capability Name                   Reference
   ACL                    [RFC4314]
   ANNOTATE-EXPERIMENT-1  [RFC5257]
   APPENDLIMIT            [RFC7889]
   AUTH=                  [RFC3501][RFC-ietf-extra-imap4rev2-30]
   BINARY                 [RFC3516]
   CATENATE               [RFC4469]
   CHILDREN               [RFC3348]
   COMPRESS=DEFLATE       [RFC4978]
   CONDSTORE              [RFC7162]
   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=             [RFC6785]
   LANGUAGE               [RFC5255]
   LIST-EXTENDED          [RFC5258]
   LIST-MYRIGHTS          [RFC8440]
   LIST-STATUS            [RFC5819]
   LITERAL+               [RFC7888]
   LITERAL-               [RFC7888]
   LOGIN-REFERRALS        [RFC2221]
   LOGINDISABLED          [RFC3501][RFC-ietf-extra-imap4rev2-30]
   MAILBOX-REFERRALS      [RFC2193]
   METADATA               [RFC5464]
   METADATA-SERVER        [RFC5464]
   MOVE                   [RFC6851]
   MULTIAPPEND            [RFC3502]
   MULTISEARCH            [RFC7377]
   NAMESPACE              [RFC2342]
   NOTIFY                 [RFC5465]
   OBJECTID               [RFC8474]
   PREVIEW                [RFC8970]
   QRESYNC                [RFC7162]
   QUOTA                  [RFC2087]
   REPLACE                [RFC8508]
   RIGHTS=                [RFC4314]
   SASL-IR                [RFC4959]
   SAVEDATE               [RFC8514]
   SEARCH=FUZZY           [RFC6203]
   SEARCHRES              [RFC5182]
   SORT                   [RFC5256]
   SORT=DISPLAY           [RFC5957]
   SPECIAL-USE            [RFC6154]
   STARTTLS               [RFC3501][RFC-ietf-extra-imap4rev2-30]
   STATUS=SIZE            [RFC8438]
   THREAD                 [RFC5256]
   UIDPLUS                [RFC4315]
   UNAUTHENTICATE         [RFC8437]
   UNSELECT               [RFC3691]
   URL-PARTIAL            [RFC5550]
   URLAUTH                [RFC4467]
   URLAUTH=BINARY         [RFC5524][RFC Errata 6214]
   UTF8=ACCEPT            [RFC6855]
   UTF8=ALL (OBSOLETE)    [RFC5738][RFC6855]
   UTF8=APPEND (OBSOLETE) [RFC5738][RFC6855]
   UTF8=ONLY              [RFC6855]
   UTF8=USER (OBSOLETE)   [RFC5738][RFC6855]
   WITHIN                 [RFC5032]