North American Network Operators Group|
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Reverse DNS and SMTP
We have recently implemented a policy on our mail servers of not accepting mail from hosts that do not correctly resolve via reverse DNS. While we on the technical side love the idea, there have been some questions from the business side of the house. If an ISP who doesn't have reverse DNS setup correctly on their mail servers, we point them to the RFC's and generally offer to help them correct it. We have noticed that our spam has reduced drastically, and the complaints are few, but alas this is a double edged sword, where if you even block 1 legitimate e-mail out of the 100K+ that we receive daily, someone is going to complain. Just curious if anybody here is doing the same and the response that they have had from doing so. Replies off list are fine and I will summarize if people are interested. Thanks, Patrick -- Patrick Muldoon, Network/Software Engineer INOC, LLC [email protected] Press Ctrl-Alt-Del now for IQ test.