Greetings, all. It's been a while since I've posted here. Yes, I am running an old version of ISPConfig. Management policies don't allow me to upgrade currently. One of my hosting customers serves up his web pages and DNS using ISPConfig. His e-mail, though, is handled by his own mail server off my network. I have no problem setting up his MX records such that mail from outside gets sent directly to his mail server. However, we've got a problem with e-mail generated by the ISPConfig server itself (like e-mails generated by web forms on the ISPConfig server). Since the customer's domain is written into /etc/postfix/local-host-names, ISPConfig tries to deliver all of this customer's e-mail locally. I can adjust the postfix config files to get mail for this domain relayed properly to their server, but ISPConfig wants to rewrite those config files. How can I tell ISPConfig to accept mail for mycustomer.com but not try to deliver locally to mycustomer.com users, in a way that ISPConfig will remember?