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Re:Ten Commandments of How to Write an IMAP Client (2006) by fanf2 on Monday October 28, 2019 @08:54AM (#21376433)
IMAP has two ways of numbering messages. It is important to be clear whether you are discussing message sequence numbers (which are dense, and compacted on EXPUNGE) or unique IDs (which are not compacted). GP was complaining about MSNs, your reply is about UIDs.

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