[cobalt-users] majordomo sender correction.

[Genesisbae@xxxxxxx]

can someone tell me exactly which file I should touch to fix following 
problem?

I have created a test user list. and name it "support"
It is from domain name : mydesigners.com

If I send an email to this list, I get an email with 
sender : mail_list-site8@xxxxxxxxxxxxxxxxxxxxx
"host.myservername.com" is just a machine name

Now, I want to see this sender as : support@xxxxxxxxxxxxxxx
I have looked at some majordomo files like
    aliases.majordomo
    majordomo.cf
    majordomo.pl

but before I do anything,  I want to hear from the professionals.
Please someone help.

Genesis.