qpsmtpd as a mail proxy for outgoing mail

Hi list,

I've been looking around for this solution and qpsmtpd seems to be the 
closest thing that I found. Let me explain:

I would like to do something similar with SMTP that Perdition 
(http://horms.net/projects/perdition/) does for IMAP/POP. Namely, when 
the user authenticates, his conversation would be forwarded to target 
outgoing mail server, based on his authentication details.

Basically have one SMTP "gateway" that forwards outgoing mail based on 
user credentials.

As qsmtpd already has a plugin that autenticates against another SMTP 
server (http://wiki.qpsmtpd.org/doku.php?id=plugins:auth:auth_smtpd) and 
perl already has libraries for talking to SMTP, it seems this wouldn't 
be impossible to do with qsmtpd.


The $100 question: has anybody had any experience setting up a 
configuration like this? Is it even possible with qsmtpd?


Thank you,
B