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Implement IMAP REPLACE extension, RFC 8508.

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REPLACE can be used to update draft messages as you are editing. Instead of
requiring an APPEND and STORE of \Deleted and EXPUNGE. REPLACE works
atomically.

It has a syntax similar to APPEND, just allows you to specify the message to
replace that's in the currently selected mailbox. The regular REPLACE-command
works on a message sequence number, the UID REPLACE commands on a uid. The
destination mailbox, of the updated message, can be different. For example to
move a draft message from the Drafts folder to the Sent folder.

We have to do quite some bookkeeping, e.g. for updating (message) counts for
the mailbox, checking quota, un/retraining the junk filter. During a
synchronizing literal, we check the parameters early and reject if the replace
would fail (eg over quota, bad destination mailbox).
This commit is contained in:
Mechiel Lukkien
2025-02-25 23:27:19 +01:00
parent 1066eb4c9f
commit 92a87acfcb
7 changed files with 602 additions and 4 deletions
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rfc/index.txt
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@ -231,7 +231,7 @@ https://www.iana.org/assignments/message-headers/message-headers.xhtml
8440 ? - IMAP4 Extension for Returning MYRIGHTS Information in Extended LIST
8457 No - IMAP "$Important" Keyword and "\Important" Special-Use Attribute
8474 Roadmap - IMAP Extension for Object Identifiers
8508 Roadmap - IMAP REPLACE Extension
8508 Yes - IMAP REPLACE Extension
8514 Yes - Internet Message Access Protocol (IMAP) - SAVEDATE Extension
8970 Roadmap - IMAP4 Extension: Message Preview Generation
9208 Partial - IMAP QUOTA Extension