[ic] ic and qmail

[Patrick Donker]

Hi people,
I hope you can help me with this trivial problem, but as I dont have 
*any* perl knowledge it still needs your help;
As mta I use qmail in a virtual domain environment. If I send email from 
within ic it takes the default domain as (amongst others) its return 
path. This is easy to solve my setting some qmail-inject variables. 
Question remains how to do this from within ic. I need a per catalog 
setting, so it would be great if there is a way to do this using 
catalog.cfg.
In interchange.cfg I found this:

## This is only needed if you use Net::SMTP instead of
## sendmail or clones
Variable MV_SMTPHOST smtp

What does this do? How do I know if ic is using net:smtp or sendmail? I 
didnt find anything in the docs. What is the best way of setting 
environment variables in ic?

Thanks
-Patrick