Sending mail via Exchange, why am I being flagged as spam?

Posted by Dan on Server Fault See other posts from Server Fault or by Dan
Published on 2010-12-01T21:18:12Z Indexed on 2010/12/21 21:56 UTC
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exchange-2007

Exchange 2007 uses direct DNS for all outgoing mail. Mail that is sent from our public IP (1.2.3.4 - this is the IP of my mailserver) is delivered to the spam folders for providers such as Comcast and yahoo.

Currently, our SPF looks like this: v=spf1 ip4:1.2.3.4 mx a:mail.domain.com ?all

MX: mail.domain.com.(10)

The reverse DNS entry on our ISP is mail.domain.com for our IP

The banner HELO response from our server is <220 mail.domain.com>

Our IP address is NOT blacklisted anywhere, and the Cisco Senderbase gives us a score of Good

What is the reason our mail doesn't look legit?

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