I'm not an expert on IMAP. I don't use it and know very little about it. But
not being completely afraid to make a fool out of myself I have two thoughts:
1. I added code to nmh years ago that calls external hook programs when
messages are inc'd, rmm'd, and refiled. It does the right thing on
sortm too. Probably not completely bug free but has worked fine with
an external program that I wrote that indexes mail and other stuff.
Can whatever is needed be accomplished by calling external programs
using this code?
2. Can IMAP unique IDs and such be stored as X-Header stuff?
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