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https://github.com/foxcpp/imap-caps-support

Index of client-side IMAP extensions support, used to prioritize support in maddy
https://github.com/foxcpp/imap-caps-support

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Index of client-side IMAP extensions support, used to prioritize support in maddy

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IMAP clients capability support status index
=============================================

**Disclaimer:** Updated when I feel like it, correct as I like it.
In most cases, information is taked from https://codesearch.debian.net.

The table for servers support can be found on imapwiki:
https://www.imapwiki.org/Specs

Capabilities list taken from related IANA registry at 2019-06-01.
Obsolete extensions are not included.

A client is considered to support extension if it checks its support on the
server by looking at returned capabilities list. Even if it doesn't actually
makes any use of it.

**Legend:** `?` - unknown (probably doesn't support), `+` - supports, `-` -
doesn't support (check git blame for update timestamp)

Capability Name | Thunderbird | KMail | Roundcube | Rainloop | mutt | balsa | geary | Evolution |
-----------------------------------|:-----------:|:-----:|:---------:|:--------:|:----:|:-----:|:-----:|:----------|
[ACL][RFC4314] | + | + | + | - | + | + | - | - |
[ANNOTATE-EXPERIMENT-1][RFC5257] | - | - | - | - | - | - | - | - |
[APPENDLIMIT][RFC7889] | - | - | - | - | - | - | - | - |
[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] | + | + | + | - | + | + | ? | - |
[MAILBOX-REFERRALS][RFC2193] | - | - | - | - | - | - | - | - |
[METADATA][RFC5464] | ? | + | + | - | - | - | - | - |
[METADATA-SERVER][RFC5464] | ? | ? | + | - | - | - | - | - |
[MOVE][RFC6851] | + | + | + | - | - | - | ? | ? |
[MULTIAPPEND][RFC3502] | ? | ? | ? | ? | ? | + | ? | ? |
[MULTISEARCH][RFC7377] | ? | ? | ? | ? | ? | - | ? | ? |
[NAMESPACE][RFC2342] | + | ? | ? | ? | + | + | ? | + |
[NOTIFY][RFC5465] | ? | ? | ? | ? | ? | ? | ? | + |
[OBJECTID][RFC8474] | ? | ? | ? | ? | ? | ? | ? | ? |
[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] | + | + | + | + | + | + | + | + |
[STATUS=SIZE][RFC8438] | ? | ? | ? | ? | ? | ? | ? | ? |
[THREAD][RFC5256] | ? | ? | ? | ? | ? | + | ? | ? |
[UIDPLUS][RFC4315] | + | + | ? | ? | ? | + | ? | ? |
[UNAUTHENTICATE][RFC8437] | ? | ? | ? | ? | ? | ? | ? | ? |
[UNSELECT][RFC3691] | ? | ? | ? | ? | ? | + | ? | ? |
[URLFETCH=BINARY][RFC5524] | ? | ? | ? | ? | ? | ? | ? | ? |
[URL-PARTIAL][RFC5550] | ? | ? | ? | ? | ? | ? | ? | ? |
[URLAUTH][RFC4467] | ? | ? | ? | ? | ? | ? | ? | ? |
[UTF8=ACCEPT][RFC6855] | ? | ? | ? | ? | + | ? | ? | + |
[UTF8=ONLY][RFC6855] | ? | ? | ? | ? | + | ? | ? | + |
[WITHIN][RFC5032] | ? | ? | ? | ? | ? | ? | ? | ? |

[RFC4314]: https://tools.ietf.org/html/rfc4314
[RFC5257]: https://tools.ietf.org/html/rfc5257
[RFC7889]: https://tools.ietf.org/html/rfc7889
[RFC3501]: https://tools.ietf.org/html/rfc3501
[RFC3516]: https://tools.ietf.org/html/rfc3516
[RFC4469]: https://tools.ietf.org/html/rfc4469
[RFC3348]: https://tools.ietf.org/html/rfc3348
[RFC4978]: https://tools.ietf.org/html/rfc4978
[RFC7162]: https://tools.ietf.org/html/rfc7162
[RFC5267]: https://tools.ietf.org/html/rfc5267
[RFC5267]: https://tools.ietf.org/html/rfc5267
[RFC5259]: https://tools.ietf.org/html/rfc5259
[RFC6154]: https://tools.ietf.org/html/rfc6154
[RFC5161]: https://tools.ietf.org/html/rfc5161
[RFC4731]: https://tools.ietf.org/html/rfc4731
[RFC5267]: https://tools.ietf.org/html/rfc5267
[RFC5466]: https://tools.ietf.org/html/rfc5466
[RFC5255]: https://tools.ietf.org/html/rfc5255
[RFC5255]: https://tools.ietf.org/html/rfc5255
[RFC2971]: https://tools.ietf.org/html/rfc2971
[RFC2177]: https://tools.ietf.org/html/rfc2177
[RFC6785]: https://tools.ietf.org/html/rfc6785
[RFC5255]: https://tools.ietf.org/html/rfc5255
[RFC5258]: https://tools.ietf.org/html/rfc5258
[RFC8440]: https://tools.ietf.org/html/rfc8440
[RFC5819]: https://tools.ietf.org/html/rfc5819
[RFC7888]: https://tools.ietf.org/html/rfc7888
[RFC7888]: https://tools.ietf.org/html/rfc7888
[RFC2221]: https://tools.ietf.org/html/rfc2221
[RFC2595]: https://tools.ietf.org/html/rfc2595
[RFC3501]: https://tools.ietf.org/html/rfc3501
[RFC2193]: https://tools.ietf.org/html/rfc2193
[RFC5464]: https://tools.ietf.org/html/rfc5464
[RFC5464]: https://tools.ietf.org/html/rfc5464
[RFC6851]: https://tools.ietf.org/html/rfc6851
[RFC3502]: https://tools.ietf.org/html/rfc3502
[RFC7377]: https://tools.ietf.org/html/rfc7377
[RFC2342]: https://tools.ietf.org/html/rfc2342
[RFC5465]: https://tools.ietf.org/html/rfc5465
[RFC8474]: https://tools.ietf.org/html/rfc8474
[RFC7162]: https://tools.ietf.org/html/rfc7162
[RFC2087]: https://tools.ietf.org/html/rfc2087
[RFC8508]: https://tools.ietf.org/html/rfc8508
[RFC4314]: https://tools.ietf.org/html/rfc4314
[RFC4959]: https://tools.ietf.org/html/rfc4959
[RFC8514]: https://tools.ietf.org/html/rfc8514
[RFC6203]: https://tools.ietf.org/html/rfc6203
[RFC5182]: https://tools.ietf.org/html/rfc5182
[RFC5256]: https://tools.ietf.org/html/rfc5256
[RFC5957]: https://tools.ietf.org/html/rfc5957
[RFC6154]: https://tools.ietf.org/html/rfc6154
[RFC2595]: https://tools.ietf.org/html/rfc2595
[RFC3501]: https://tools.ietf.org/html/rfc3501
[RFC8438]: https://tools.ietf.org/html/rfc8438
[RFC5256]: https://tools.ietf.org/html/rfc5256
[RFC4315]: https://tools.ietf.org/html/rfc4315
[RFC8437]: https://tools.ietf.org/html/rfc8437
[RFC3691]: https://tools.ietf.org/html/rfc3691
[RFC5524]: https://tools.ietf.org/html/rfc5524
[RFC5550]: https://tools.ietf.org/html/rfc5550
[RFC4467]: https://tools.ietf.org/html/rfc4467
[RFC6855]: https://tools.ietf.org/html/rfc6855
[RFC5738]: https://tools.ietf.org/html/rfc5738
[RFC6855]: https://tools.ietf.org/html/rfc6855
[RFC5738]: https://tools.ietf.org/html/rfc5738
[RFC6855]: https://tools.ietf.org/html/rfc6855
[RFC6855]: https://tools.ietf.org/html/rfc6855
[RFC5738]: https://tools.ietf.org/html/rfc5738
[RFC6855]: https://tools.ietf.org/html/rfc6855
[RFC5032]: https://tools.ietf.org/html/rfc5032