Am sure that this is simple stupid: but I need help. I have 2 machines running 5.5: mail.x.net, also machine mail2.x.net I placed a mailbox on mail2.x.net for xyz.com xyz.com's MX record also points to mail2.x.net. But when the an email is sent to the mailbox, I get a return email saying that mail.x.net (NOT! from mail2.x.net) saying that mail.x.net does not allow relaying. True mail.x.net machine is in charge of routing - but how do I get the mailbox to live, be accessed and receive/send mail correctly. Mail.x.machine is overloaded with mailboxes - and we are trying to spread the load. What I have set up incorrectly?