Why doesn't Dovecot work?
- Make sure you're looking at the correct log files. Debug messages may be in a different log file than error messages. See ["Logging"]
Try logging in manually by sending IMAP commands. If you're trying with an IMAP client you can't be sure if the problem is with the client's configuration or Dovecot's configuration. See TestInstallation (or TestPop3Installation).
It says password mismatch
If you're using PAM:
- Make sure that dovecot-auth is running as root (assuming it's using shadow files).
PAM errors aren't logged to Dovecot's own logs. Usually they go to /var/log/auth.log or something similar.
- Unfortunately PAM's error messages aren't all that helpful always in figuring out what the problem is.
Usually the problem is that you don't have correctly named file in /etc/pam.d. See ["PasswordDatabase/PAM"]
For non-PAM set auth_debug_passwords=yes and look at what it says in the logs. If it's trying to use a wrong password scheme, you can change that. See ["Authentication/PasswordSchemes"]