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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).