virtual hosting, wrong addresser

[chris @ netborders . com]

I host several domains on my main server (one.com for 
ease of explanation)

A customer, two.com hosted on one.com has a majordomo
list.  But trying to send a message from two.com to its
list members arrive FROM wrong address(ie one.com) which 
is my main domain.

It sounds simple, what am doing wrong?  I just joined
this users list today and am completely new to 
majordomo.  Any help would be appreciated, thanks.

I use BSDi OS.

Chris Maclean