OSX MAIL SERVICE NOT SETTING MAIL AS READ

Question

I have osx server with mail service enabled. I have numerous accounts setup and working correctly. I have two accounts which are not functioning correctly
when the user reads his email, the email registers as read on the computer, in his email client...however when the user reopens his email client, all the emails that he previously read reappears as being unread. I have setup these IMAP accounts on different computers and using different email clients.. and each computer and each client responds exactly the same way. How do I reset the accounts to accept email normally and recognize that mail is indeed read and tells the server the correct commands for this to happen....my email is [email protected], if anyone has a solution please help

Answer 1

Assuming you are using the default paths (if not adjust):
cd into /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.
Use terminal, not Finder.
HTH,
Alex