You use a dovecot setup and email users are authenticated by dovecot. PAM is not involved at all, so if you read something about PAM, then this is nothing that applies to your server.
Are you sure that you used the full email address as suername and not just the part in front of the @ to authenticate the mail user? Some applications like thunderbird are a bit buggy as they strip the part after the @ whebn you create a email account and ypu have to set the full email address as username again after setting up the account.
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