[Dovecot] SASL using different auth database?

[Dave McGuire]

   Hi folks.  Is it possible to configure Dovecot to authenticate  
against one mechanism (i.e., /etc/passwd) for POP/IMAP connections,  
while providing a SASL authentication socket that satisfies  
authentication requests against a different mechanism, say MySQL?

   The goal here is to allow users to have different passwords for  
SMTP authentication and POP/IMAP connections.  I am converting an  
existing installation to Dovecot...this installation currently has  
quite a few users who are configured with SMTP authentication (Cyrus  
SASL/saslauthdb) using different passwords than are configured for  
their POP connections (via cucipop, /etc/passwd).  If someone can  
think of any better way to accomplish this goal, I'm all ears.

              Thanks,
              -Dave

-- 
Dave McGuire
Port Charlotte, FL