How do I configure OS X Server (Mountain Lion) to deliver mail from another domain to my mailbox?

Question

How do I configure OS X Server (Mountain Lion) to deliver mail from another domain to my mailbox?
I run a personal Server at my office. It's configured under my own domain as server.mydomain.com. It's setup that it properly receives and sends e-mail for mydomain.com. I use my own mailbox [email protected] to get all my personal mail.
I'm looking to add another domain as a secondary way for people to get to my content and information.
I want the same address [email protected] and [email protected] to arrive in the same mailbox at my server.
How do i do that?

Answer 1

it does look like you can add virtual domains in the GUI of Server.app on at least some versions, but I don't have an OS X Server 10.8 version handy to check.
I'd encourage spending some time to learn the command line.  In general, the payoff for learning the command line will be worth the effort expended.  You're running a mail server here and sooner or later the capabilities of the GUI will fail you.  This whether due to a configuration omission in the GUI itself, or due to the need to troubleshoot a malfunctioning mail server, a need to automate one or more of the Postfix-related sequences, or some other IT-related task.  Entirely FWIW, of course.
Here's a cut-and-paste of the sequence just used to test the command line access to the Postfix configuration, first fetching the current value, appending example.com as the second domain, then displaying the new value, then restarting the Postfix server.  Don't enter the dollar signs; just the postconf command and following.  Adjust example.com to match your domain...
$ postconf mydestination
mydestination = $myhostname, localhost.$mydomain, localhost
$ sudo postconf -e 'mydestination = $myhostname, localhost.$mydomain, localhost, example.com'
Password: {your admin password here}
$ postconf mydestination
mydestination = $myhostname, localhost.$mydomain, localhost, example.com
$ sudo postfix reload
The Postfix and Postconf commands work irrespective of the OS X Server version; the tools reference the data files as needed.