[cobalt-developers] Sendmail error

["Or-Or" <or-or.list2@xxxxxxxxxxxxxx>]

Hey all. I'm getting an error at random that I can't seem to find the cause.
The dns is working perfect and this server is able to resolve any address
via shell. There is no anti-spam or virus filtering software installed that
could be interfering. Does anyone know what could be causing this problem?



Mar  1 10:17:33 web24 sendmail[13418]: i21FHWZ13418: ruleset=check_mail,
arg1=<foo@xxxxxxx>, relay=[123.123.123.123], reject=451 4.1.8 Domain of
sender address foo@xxxxxxx does not resolve


Regards, 

Chris