[Dovecot] Authentication

Hi

I am looking to use dovecot with postfix/amavis/spamassasin and would like to be able to deliver spam/virus emails into specific virtual user folders.

I wanted to know if it is possible to authenticate user for IMAP and POP3 access seperately using a database?

All I have seen in the documentation/wiki is a single query for authentication.

Regards,

Isaac