unknown non-delivery reason

[revsinn]

when one of my clients emails one of my coworkers, my freebsd server kicks the message back with the following error message:

----------------------------- ERROR REPORT -----------------------------
Message could not be delivered to the following recipient:

user / mtka-unix-mime
DDT1=RFC-822; DDV1=user@domain.net;

because: Unknown Non-Delivery Reason (520)
------------------------------------------------------------------------

Seems to be coming from one or both of my mail servers. I'm at a loss...any ideas?

Thanks!

#!/usr/bin/girl/ReverendSinn

 

[axvpaa]

what is the mail server? ( sendmail?)
tia,
alex

 

[Deleted]

Is the message being sent locally from the CLI or over the network? What does the maillog output?

#/usr/bin/friendster -w

my @message = ('Are','You','From','Chicago?');
foreach my $line (@message) {
print $line;
}