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)


You should see a list of files that look something like:


Make a copy and delete the one belonging to the user you have problems with.

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