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| Extension | Description | Reference |
| ACL | Access control lists (ACLs) | RFC 4314 |
| ANNOTATE | Maintain metadata | draft-ietf-imapext-annotate |
| ANNOTATEMORE | Maintain more metadata | draft-daboo-imap-annotatemore |
| BINARY | Binary content | RFC 3516 |
| CATENATE | Message assembly from pieces | RFC 4469 |
| COMPRESS=DEFLATE | Compression | draft-ietf-lemonade-compress |
| CONDSTORE | Conditional storage to a mailbox | RFC 4451 |
| ESEARCH | Adds SEARCH return options that control what kind of information is returned | RFC 4731 |
| ID | Identify the IMAP software | RFC 2971 |
| IDLE | Push new mail notifications | RFC 2177 |
| LITERAL+ | Non-synchronising literals | RFC 2088 |
| LOGIN-REFERRALS | Login referrals | RFC 2221 |
| MAILBOX-REFERRALS | Mailbox referrals | RFC 2193 |
| MULTIAPPEND | Multi-appending | RFC 3502 |
| NAMESPACE | mailbox namespaces | RFC 2342 |
| QUOTA | Resource usage | RFC 2087 |
| SEARCHRES | Allows to easily reference the result of the last SEARCH command in other subsequent commands | draft-melnikov-imap-search-res |
| SORT | Sorting of views | draft-ietf-imapext-sort |
| THREAD | Server-based threading | draft-ietf-imapext-sort |
| UIDPLUS | Better disconnected support | RFC 4315 |
| UNSELECT | Closes the mailbox without expunging it | RFC 3691 |
| URLAUTH | Signed URLs for access | RFC 4467 |
| WITHIN | Extension to IMAP SEARCH | RFC 5032 |
The following extensions have been withdrawn or are expired:
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