Internet Message Access Protocol (IMAP) Capabilities Registry Last Updated 2020-12-21 Available Formats [IMG] XML [IMG] HTML [IMG] Plain text 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. Available Formats [IMG] CSV Capability Name Reference ACL [RFC4314] ANNOTATE-EXPERIMENT-1 [RFC5257] APPENDLIMIT [RFC7889] AUTH= [RFC3501] 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 [RFC2595][RFC3501] 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 [RFC2595][RFC3501] 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]