Actually, the error is as follows: <vaxman@tmesis.com <mailto:vaxman@tmesis.com>>: host mail.tmesis.com <http://mail.tmesis.com/>[24.187.213.26] said: 554 5.7.1 Message rejected due to header contents. (in reply to end of DATA command) Reporting-MTA: dns; savfw21a.sans.org <http://savfw21a.sans.org/> X-Spam-Firewall-Queue-ID: D979713C0F8 X-Spam-Firewall-Sender: rfc822; dhoelzer@enclaveforensics.com <mailto:dhoelzer@enclaveforensics.com> Arrival-Date: Tue, 1 Dec 2015 20:19:42 +0000 (GMT) Final-Recipient: rfc822; vaxman@tmesis.com <mailto:vaxman@tmesis.com> Original-Recipient: rfc822;vaxman@tmesis.com <mailto:vaxman@tmesis.com> Action: failed Status: 5.7.1 Remote-MTA: dns; mail.tmesis.com <http://mail.tmesis.com/> Diagnostic-Code: smtp; 554 5.7.1 Message rejected due to header contents.