Reverse DNS doesn't work |
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Josh 
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 Topic: Reverse DNS doesn't workPosted: 17 November 2003 at 3:35pm |
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I have reverse DNS set to reject if there is no reverse DNS. As you can see from the logs below (email and ips changed) but it accepts the connection runs a reverse dns lookup and comes up wtih it being a comcast.net address which is a cable modem address. It does not reject the connection however it accepts it despite the fact that the domain sending the email is different then what it found in the reverse DNS lookup. What am I missing?? thankyou, Josh 11/17/03 14:18:01:062 -- (352) Connection from: 68.44.129.35 - Originating country : United States 11/17/03 14:18:07:718 -- (352) - MAPS search done... . |
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LogSat
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Joined: 25 January 2005 Location: United States Status: Offline Points: 4106 |
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Posted: 17 November 2003 at 10:49pm |
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Josh, The reverse DNS simply checks to see if there is a PTR record associated with that IP address. The fact that the reverse DNS does not match with the email address is perfectly normal. We have a mail server that handles about 8,000 domains. However the SMTP server is of course using a single IP. The reverse DNS for that IP resolves to a specific domain. But the other 7,999 domains are also using that IP, and then "they" send emails out, the reverse dns of course won't match. What could be done however is to, once retrieved the reverse DNS, ping that name to see if it actually matches the originating IP. Since it's very easy to setup fake reverse DNS entries, this would catch all fake entries. This feature is on our wish list, and will be implemented soon. Roberto F. |
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