Mail keeps showing unread although I just read it.
Sometimes it can happen that the Cyrus IMAP index file keeping track of the read/unread flags on the server is broken.
To fix this, open terminal and cd into:
(Assuming you are using the default paths; if not adjust)
/var/imap/user/firstletterofusername/
You should see a list of files that look something like:
username.seen
Make a copy and delete the one belonging to the user you have problems with.
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