NIOIMAP supports a variety of known IMAP extensions. If you'd like support for an extension not listed or ticket below, file an issue, or create a PR.
| Capability | RFC |
|---|---|
| APPENDLIMIT | [RFC7889]((https://www.iana.org/go/rfc7889) |
| AUTH= | RFC3501 |
| BINARY | RFC3516 |
| CATENATE | RFC4469 |
| CHILDREN | RFC3348 |
| CONDSTORE | RFC7162 |
| CREATE-SPECIAL-USE | RFC6154 |
| ENABLE | RFC5161 |
| ESEARCH | RFC4731 |
| IDLE | RFC2177 |
| ID | RFC2971 |
| LIST-EXTENDED | RFC5258 |
| LIST-STATUS | RFC5819 |
| LITERAL+ | RFC7888 |
| LITERAL- | RFC7888 |
| LOGIN-REFERRALS | RFC2221 |
| LOGINDISABLED | RFC3501 |
| MESSAGELIMIT | MessageLimitDraft |
| METADATA-SERVER | RFC5464 |
| METADATA | RFC5464 |
| MOVE | RFC6851 |
| MULTIAPPEND | RFC3502 |
| MULTISEARCH | RFC7377 |
| NAMESPACE | RFC2342 |
| PARTIAL | RFC9394 |
| PREVIEW | RFC8970 |
| QRESYNC | RFC7162 |
| QUOTA | RFC2087 |
| SASL-IR | RFC4959 |
| SEARCHRES | RFC5182 |
| SPECIAL-USE | RFC6154 |
| STARTTLS | RFC3501 |
| STATUS=SIZE | RFC8438 |
| UIDPLUS | RFC4315 |
| UNSELECT | RFC3691 |
| URLAUTH | RFC4467 |
| WITHIN | RFC5032 |
We have also implemented:
- "Collected Extensions to IMAP 4", RFC4466.
- Gmail IMAP extensions https://developers.google.com/gmail/imap/imap-extensions