HDR From: The Post Office <postmaster>
HDR Sender:	mailer-daemon
SUB Subject: Invalid host/domain name
ADR Cc: The Post Office <postoffice>

In the following message, it appears from the format of certain
addresses that you were trying to submit an article to a USENET
newsgroup.
Unfortunately, the newsgroup names could not be found in our list
of active newsgroups, and therefore posting to it is not possible.

Contact Postmaster for comments/questions about this facility.