[Dovecot] Authenting in Linuxconf format

[Marc Perkel]

I have an existing email system and I'm trying to addapt dovecot into 
it. It uses the linuxconf virtual email format. The way it is set up is 
there there are multiple passwd/shadow files - one for eact domain. They 
are in standard format. The names of these files are:

/etc/vmail/passwd.domain.com
/etc/vmail/shadow.domain.com

I tried this:

auth_userdb = passwd-file /etc/vmail/passwd.%d
auth_passdb = passwd-file /etc/vmail/shadow.%d

but - it didn't expand the %d

So - is this going to work? If not - how do you do virtual domains? The 
documentation is less than complete on this.