Hi, This is probably a simple problem, although I'm having trouble explaining! Here it goes: I have an ubuntu server running lamp with postfix. I just want to use postfix to send mail from php, nothing else. I use a third party server as my mail server which handles various addressses, like email@example.com. When I get php to send a mail to firstname.lastname@example.org, it incorrectly goes to the LAMP's postfix server, which then sends a user not found bounce. Instead, when I get php to send a mail to email@example.com, shouldn't it use the third party mail server as specified by the MX records? I'm not sure what's going on but I presume this is a postfix configuration problem? Please could someone help me to get postfix sending emails to the MX server, not itself!! Thanks!