Reverse DNS is not the issue
Code:
$ dig +short unix-heaven.org
78.90.73.87
$ dig +short -x 78.90.73.87
unix-heaven.org.
I wonder what kind of header you posted
A header of spam message received by Gmail looks like this
Code:
Delivered-To: pietjepuk@gmail.com
Received: by 10.114.151.3 with SMTP id y3cs187278wad;
Tue, 4 Nov 2008 15:17:48 -0800 (PST)
Received: by 10.214.95.39 with SMTP id s39mr183633qab.386.1225840667434;
Tue, 04 Nov 2008 15:17:47 -0800 (PST)
Return-Path: <MamiebehalfPierre@breitbart.com>
Received: from supersof2fa61c ([119.73.111.147])
by mx.google.com with SMTP id 2si1177262qyk.84.2008.11.04.15.17.43;
Tue, 04 Nov 2008 15:17:47 -0800 (PST)
Received-SPF: neutral (google.com: 119.73.111.147 is neither permitted nor denied by best guess record for domain of MamiebehalfPierre@breitbart.com) client-ip=119.73.111.147;
Authentication-Results: mx.google.com; spf=neutral (google.com: 119.73.111.147 is neither permitted nor denied by best guess record for domain of MamiebehalfPierre@breitbart.com) smtp.mail=MamiebehalfPierre@breitbart.com
Received: (from tomcat@localhost)
by 105.120.186.176 (8.12.8/8.12.8/Submit) id j6CHmn3V903716
for pietjepuk@gmail.com; Tue, 4 Nov 2008 16:16:44 +0800
Date: Tue, 4 Nov 2008 16:16:44 +0800
Message-ID: <442p730s.4904410@breitbart.com>