I have a client who is sending mail to lots of clients through a group called Boberdoo, who also uses another company SendGrid to actually send the emails through.
The domain we're sending from is mercuryroadassociates.com.
The messages that are being sent are fairly simple, some information about a client, their email address, website link if applicable, and a link back to the Boberdoo lead distribution site.
GoDaddy and Google Apps (standard, not the sweet Postini filtering version) accept the mail with no issue, however I have to completely disable the spam filter on Comcast to let them through, and my own Exchange server with McAfee hosted spam filtering gives it a 99.9999% spam confidence rating and defers it right away.
The SendGrid company appears to do everything correctly as they're signing messages with DKIM and also have valid SPF records.
Where should I begin?
Attached is a long header for the message that made it into my inbox.
Subject: Mercury Road Associates Leads Delivery (Executive/Entrepreneur Call Verified Lead)
Date: March 9, 2011 4:09:12 PM MST
To: Jordan Philip <firstname.lastname@example.org>
Received: by 10.14.126.10 with SMTP id a10cs88086eei; Wed, 9 Mar 2011 15:09:15 -0800 (PST)
Received: by 10.236.27.98 with SMTP id d62mr29203yha.5.1299712154766; Wed, 09 Mar 2011 15:09:14 -0800 (PST)
Received: from o208115235243.static.reverse.sendgrid.net (o208115235243.static.reverse.sendgrid.net [126.96.36.199]) by mx.google.com with SMTP id j44si5815576yhn.206.2011.03.09.15.09.12; Wed, 09 Mar 2011 15:09:13 -0800 (PST)
Received: by 10.12.16.30 with SMTP id mf25.651.4D7808988 Wed, 09 Mar 2011 17:09:12 -0600 (CST)
Received: from leads.mercuryroadassociates.com (unknown [10.9.180.5]) by mi8 (SG) with ESMTP id 4d780898.68e7.2d78a3 for <email@example.com>; Wed, 09 Mar 2011 17:09:12 -0600 (CST)
Received-Spf: pass (google.com: domain of firstname.lastname@example.org designates 188.8.131.52 as permitted sender) client-ip=184.108.40.206;
Authentication-Results: mx.google.com; spf=pass (google.com: domain of email@example.com designates 220.127.116.11 as permitted sender) firstname.lastname@example.org; dkim=pass email@example.com
Dkim-Signature: v=1; a=rsa-sha1; c=relaxed; d=sendgrid.me; h=date:to :from:reply-to:subject:message-id:mime-version :content-transfer-encoding:content-type:sender; s=smtpapi; bh=JI EVzTnb+rxIEa7ij54YlBMhtZ0=; b=Pl8aj0nUkm7H16EOrAkQ5SttVCex+nxLxQ S57dJX/2SfN++cs5CNvoCz297Cww+MSj9aszAA3HFuxDGml+h28bmsWbRNoQYIS3 SpdV84N/hbJ3NnzwUZrinZj7zhMkmYCWXGx7FU8GWxEJW1EnMQ4v+kimcOS/efgf fH3QQ6r6I=
Domainkey-Signature: a=rsa-sha1; c=nofws; d=sendgrid.me; h=date:to:from :reply-to:subject:message-id:mime-version :content-transfer-encoding:content-type:sender; q=dns; s=smtpapi; b= iX8J8Z92DNE4iZHxwj1NGp+sm/t5YYMAf/BEvj727LKkNkwQEEq5yPqLpDkR/YBe yu+31b9jB2FE89isXkmjnsu2Z99IGKikTE4iQN26X6G3OyLIWBnKzwSDZAfYLCs9 Vlw+kx9uRhKUo5jOnxWU2N3Vs+OjNJzKCjzuUaRgsbQ=
X-Mailer: PHPMailer [version 1.72]
Content-Type: text/html; charset="utf-8"
Sender: Info@Mercuryroadassociates.Com <firstname.lastname@example.org>