Secondary MX domain sometimes added to postfix

Hi,

I've just tried to refresh My secondary MX server and the process seems to not add all the domains to relay_domains in main.cf all the time

even though it the following is output:

Updating virtual server undiscovered.com.au ..

Adding secondary domain on julius.neubreed.com ..
.. done

Updating secondary MX records ..
.. done

.. done

I try a few times then occasionally the domain is added. Then I test the mail server through dnscheck.net and there's a failure for the secondary MX

http://www.checkdns.net/quickcheck.aspx?domain=undiscovered.com.au&detai...