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Ask Slashdot: Is Reverse DNS a Worthy Standard For Fighting Spam?

Posted by timothy on from the who-the-heck-are-you? dept.

drmartin66 makes it to the front page with this question: "Last weekend I installed a new spam filter server for a client, and enabled connection rejection if the sending server did not have a Reverse DNS record. Since then, I have had a number of emails rejected from regulator bodies that do not have a Reverse DNS record, and are refusing to have one created for their email server. What is your opinion of Reverse DNS records? Are they (or should they be) a standard, and required? Or are they useless for spam fighting?"

1 of 301 comments (clear)

  1. Re:Better Question... by Anon-Admin · · Score: 4, Interesting

    I hate to say it but you have way too high of an expectation of ISP's

    I have a static address on a business account via a major ISP. I have a Domain name and have DNS. My DNS resolves to www.mycompany.com but the ISP has the PTR set to 111.222.333.444.static.ISPDOMAIN.COM

    They will not change it no matter what I ask and E-mail from my domain through my e-mail server is rejected because the PTR does not match the A record. It has gotten so bad that I had to pay for a mail relay host to push my mail through. To me, this is a risk because they (The relay) could intercept, monitor, or filter the private e-mail between me and my customers which would directly effect my business.

    So, personally I say it is a bad idea!