SO i have ispconfig installed and running smooth. Here is the problem. I have a client who hosts there own e-mail server. There mx records are pointed somewhere else. They run a maillist off the server. When they send mail to anyone not in there domain the mail works fine. But if its sent to any other domain hosted it does not work. How would i correct this. Example: Domain: example1.com if i sent mail to email@example.com mail is fine. but if i send mail to firstname.lastname@example.org it wont go anywhere. Any help would be appreciate.