How to check if some user has wrong password in mail client application

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As root, in SSH run:

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grep '' /var/log/dovecot.log | grep 'Password mismatch'
If this command shows output, for example:

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Aug 30 11:56:48 auth: Info: passwd-file([email protected], Password mismatch
then someone is sending the wrong IMAP/POP3 password.

Also, check the listed IP and check if that IP is from your country because this command can show the IP of brute-force bots.

How to check if fail2ban banned some IP - viewtopic.php?t=630
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