Jestli chces muzem zkusit odeslani z meho serveru a muzes porovnat zpravu jak vypada skryty resolver SMTP a jak skutecny, jeden bych poslal bez identifikatoru a druhy s identifikaci, samozrejme IP bude stejna. 
P.S. tohle je treba z esetu objednavka:
Return-path: <smimegw@eset.cz>
Authentication-Results: certcv.com
smtp.mail=smimegw@eset.cz; ip-match=fail
Authentication-Results: certcv.com
header.from=smimegw@eset.cz; domainkeys= (no key)
Received: from smimegw.eset.cz (smimegw.eset.cz [194.213.194.216])
by certcv.com (certcv.com)
(MDaemon.PRO.v8.1.3.R)
with ESMTP id md50000000009.msg
for <certcv@certcv.com>; Fri, 02 May 2008 13:51:41 +0200
Received: by smimegw.eset.cz (Postfix, from userid 505)
id 84BF38AA5B; Fri, 2 May 2008 13:55:03 +0200 (CEST)
To: certcv@certcv.com
From: objednavky@eset.cz
Subject: Licence + faktura za reseni ESET:[ zde je me jmeno ]
MIME-Version: 1.0
Content-Disposition: attachment; filename="smime.p7m"
Content-Type: application/x-pkcs7-mime; name="smime.p7m"
Content-Transfer-Encoding: base64
Message-Id: <20080502115503.84BF38AA5B@smimegw.eset.cz>
Date: Fri, 2 May 2008 13:55:03 +0200 (CEST)
X-Spam-Processed: certcv.com, Fri, 02 May 2008 13:51:41 +0200
(not processed: message size (705465) exceeds max size (51200))
X-RBL-Warning: mail from 194.213.194.216 refused, see http://www.ordb.org/faq/
X-Lookup-Warning: MAIL lookup on smimegw@eset.cz does not match 194.213.194.216
X-MDRcpt-To: certcv@certcv.com
X-Rcpt-To: certcv@certcv.com
X-MDRemoteIP: 194.213.194.216
X-Return-Path: smimegw@eset.cz
X-MDaemon-Deliver-To: certcv@certcv.com
X-MDAV-Processed: certcv.com, Fri, 02 May 2008 13:51:42 +0200