HDR From: The Post Office <postmaster>
HDR Sender:	mailer-daemon
SUB Subject: Invalid mail gateway specification
ADR Cc: The Post Office <postoffice>

A copy of your message is being returned to you because one or more of
the addresses you specified in the message refer to a host which cannot
process your message as specified.  You should find an alternative path
to your correspondent's address, or have the mailer on this host determine
the proper route by specifying the final address relative to this host.

You may send a query to the Postmaster at this gateway if you require
further assistance.

Your message is being returned unprocessed.