I currently am using sendmail and when emails go out from any account
(I own server and offer web hosting where cleitns do not have access
to server) it says its all coming from one mail server and one IP.
Each site I own (have on server) has its own IP, I want to set it up
so that when emails go out, it says it's coming from their site and
IP, not the main
server. In essence, I want each site to have its own mailserver
address, not share one. Is this possible with sendmail? How do you do
it? If no, is there any software that would make this possible? What
are the downdraws? Also, can you configure it to work with sendmail
(i.e. have two mail servers running, with sendmail being one). I am on
Unix box. Please ask questions, if needed.