[Dovecot] %s service variable substitution

[Jim Horner]

I'm using 1.0rc15. We switched over to using deliver LDA and using dovecot's 
sasl implementation for postfix... 

In our ldap configuration we were using (similar for password filter)

user_filter = (&(objectClass=mailUser)(mail=%u)(mailSettingValue=%s))

The problem is these new services, namely deliver and postfix, are accessing 
the authentication mechanisms and I am not sure what to put in ldap so the %s 
can match. 

Each user currently only has a mailSettingValue=IMAP. This can be expanded for 
multiple entries.

Thanks,

Jim