Some email bounces = misconfigured exim?

[Arcady Genkin <genkin@sympatico.ca>]

Hi all:
It happened for the second time - an email bounced because I happen to 
have invalid domain name (i.e. my local domain name) in some
header.

Please advise where do dig. :(

My local user@machine.domain address (intranet): antipode@main.wgaf.net
My real email address: genkin@sympatico.ca

Thanks!

Here's the mailer's complaint: ------------------------------------------

A message that you sent could not be delivered to all of its recipients. The
following address(es) failed:

  my.addressee@transas.com:
    SMTP error from remote mailer after MAIL FROM:
    <antipode@main.wgaf.net> SIZE=2301:
    host anguish.transas.com [193.125.200.2]:
    501 <antipode@main.wgaf.net>... Sender domain must exist

------ This is a copy of the message, including all the headers. ------

Return-path: <antipode@main.wgaf.net>
Received: from antipode by main.wgaf.net with local (Exim 2.05 #1 (Debian))
	id 10Xwkt-0000vy-00; Thu, 15 Apr 1999 20:45:15 -0400
To: my.addressee@transas.com
Subject: My subject
Mime-Version: 1.0 (generated by tm-edit 7.108)
Content-Type: text/plain; charset=US-ASCII
From: Arcady Genkin <genkin@sympatico.ca>
Date: 15 Apr 1999 20:45:15 -0400
Message-ID: <87ogkpv1es.fsf@main.wgaf.net>
Lines: 26
X-Mailer: Gnus v5.6.45/XEmacs 20.4 - "Emerald"
Sender: Arcady Genkin <antipode@main.wgaf.net>

<the body snipped>

-- 
Arcady Genkin
"I opened up my wallet, and it's full of blood..." - GsYDE