Symptoms
When trying to access your mail server you are unable to log in and you see in the mail log:
nopassword set but password is non-empty
Description
When logging into your mail account, the login is denied despite the password being correct.
Workaround
Verify imunify 360 Exim+Dovecot brute-force attack protection option is disabled.
Please review the official Imunify documentation for further information.