> Note that this problem isn't unique to Maildirs, the mbox folders suffer
> from the same problem -- if there's new mail there in the folder, how
> can you tell if it's something you did download to the laptop and
> already deleted, or if it's something you've really not seen before?  So
> the same problem needs to be solved there.

What about keeping trash-folders of deleted mails? Merge the trash
folders, build a message-id cache, and use the "remove duplicates"
procmail filter on the incomming folder(s).

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