[Dovecot] virtual users with mysql

Hello List,

we use in our system cryptical Usernames for dovecot etc. and authenticate users against shadow/passwd

User abcde is loging in and gets data from /var/spool/mail/abcde and /home/popuser/abcde

Now we want to make it possible that users can log in also with emailadresses. I tried dovecot-mysql authentication which works fine but i do not find a way to use 2 different login-formats in my queries. login with abcde and also testname@example.com should return ok and lead to /var/spool/mail/abcde. Is this possible or i have to make a decision which format to use?

Thanks, Andre