[Mailman-Users] mail issue to moderator

[Stephen J. Turnbull]

Srinivas Rao Balla writes:

 > Oct 10 00:45:54 2014 (8899) All recipients refused:
 > {'it-hyd-owner at intra.domain.com': (550, '5.7.1 Unable to relay')},
 > msgid: <mailman.0.1412927143.9231.it-hyd at intra.domain.com>

It looks to me like you have an *internal* network configuration
issue, such that "intra.domain.com" doesn't recognize the postfix host
(also "intra"??) as an authorized local mail originating host.  So the
message is treated as an unauthorized outsde-to-outside relay and
refused.

It appears that you have redacted your host names, so it's hard to
make further guesses about what the actual problem is.  But it's not
Mailman, I think.  It's your MTAs or DNS.