[Dovecot] strip domains

Hello, Running FC5 x86_64 with dovecot-1.0-0_8.beta3.rhfc5.at Using system user/passwds for 99.99% of users...have sql user/pass enabled to test virtual users from mysql.

How do I strip off the domain when users provide user@domain.com so that my userdb and passdb use just 'user'? (disregarding sql auth...I'm not concerned with that right now).

My dovecot.conf auth config:

passdb pam { args = dovecot }

passdb sql { args = /etc/dovecot-sql.conf }

userdb passwd { }

userdb sql { args = /etc/dovecot-sql.conf }

Can I just pass userdb the 'user' using an args= statement? %d? ...and then also to the passdb?

Thanks, Curt