I sent an email to an account that doesn't exist in the somedomain.com on my zimbra server and found out the postfix program is being used to locate domain. See below:
This is the Postfix program at host host.somedomain.com.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to <postmaster>
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The Postfix program
<user@somedomain.com>: host host.somedomain.com[192.168.1.25] said: 550 5.1.1 No
such user here (in reply to RCPT TO command)
With that being found, how to do I get the postfix program to use something besides the zimbra server for the somedomain.com?