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Old 09-17-2007, 01:29 PM   #1
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My outgoing email is getting flagged as spam

I'm using sendmail on a dedicated server I lease from, running FC4. This server has two domain names, including the original generated by incorporating its static IP address ( and the domain name I registered for it . If you reverse IP lookup the IP address, you only get the name, not mine. I've had trouble choosing a domain name for confDOMAIN_NAME that doesn't cause lots of email to be rejected as SPAM, because I think receiving SMTP servers both (a) do a reverse IP address lookup on the address which connected to them and discover the name doesn't match the name given by the EHLO/HELO command, and (b) check the EHLO/HELO name for various suspicious characteristics. I'm assuming the confDOMAIN_NAME setting is used as the EHLO/HELO domain name. If I use the name for the server in confDOMAIN_NAME, various SPAM filters give all the email really high scores because of the IP address incorporated in the name. If I use my domain name, other servers flag me as SPAM because the reverse IP address lookup gives the name.

I'm a sendmail newbie. Am I understanding the problem correctly? Any advice?
Old 09-17-2007, 06:35 PM   #2
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The best way to solve that is to write to your ISP for the server (I'm guessing, but the reverse says Tell them you want to run a mail server, and you need a PTR (reverse DNS record) for the server. If the forward DNS name of your server is, then the PTR should be the same,, coupled with the IP address.



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