Hi folks,

I am running a fresh install of 8.0.2 on CentOS x64 and am having every outbound message in the "Deferred" queue with the following error:

host ::1[::1] said: 451 4.7.1 id=03504-01 - temporary mta failure on relaying, from mta(smtp:[::1]:10029): 451 4.7.1 service unavailable - try again later (in reply to end of data command)
Does anybody know what could be causing this? Port 10029 **appears** to have something to do with OpenDKIM but I'm not entirely sure what's going on here.

Thanks in advance.