ok, I have one server that is a standalone webserver. it's mint7 and is for design projects and my blog, etc. it's FQDN is "tranquilpenguin.com" I have another server that is for production sites, and it also hosts email for "@tranquilpenguin.com" I have the mx record set up correctly. Question: If I cannot email via sendmail (php mail form) to @tranquilpenguin.com from the first server. How to I make the server understand that it doesn't host email for that domain and force it to use the mx address instead? Thanks.
You must remove tranquilpenguin.com from the mydestination line in /etc/postfix/main.cf on the first server.
