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A comment on JMAP: A modern, open email protocol. Parent comment

Re:JMAP: A modern, open email protocol by sdegutis on Monday May 06, 2019 @02:45PM (#19842483)
Where UID is used now sounds like a good use case for UUIDs (or GUIDs?) that don't ever change.
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Re:JMAP: A modern, open email protocol by jcranmer on Monday May 06, 2019 @03:10PM (#19842688)
I don't specifically know the history of IMAP, particularly IMAP UID, but the semantics of UID to me implies that it was originally specified to permit its implementation as the file offsets into the mbox files that backed the store, and I believe some IMAP servers implemented it that way.

Some IMAP server implementations have a custom attribute they use to indicate a globally-unique message ID.

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