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From: Graham Hillstomer (ghillstomer_at_postmaster.co.uk)
Date: Wed Jan 01 2003 - 23:52:09 CST

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    ('binary' encoding is not supported, stored as-is) Hi!

    We have had a interesting discussion about the practical use of reverse DNS lookups and I am wondering what the general thoughts are here in the newsgroup.

    It seems that some ISP's and large sites are using it and others are not and the ones that are have a near constant complaint queue from users about not receiving emails from known good senders. The problem always resides in that the senders DNS either is not responding with correct MX information, is to slow to respond and gets automatically rejected, or returns an error code like "11004" valid but no data.

    Is using reverse DNS worth it stop x% of spammers or is it to much trouble?

    opinions? thoughts?

    Graham 

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Graham Hillstomer II
Senior System Admin *BSD, HP-UX, Solaris
Quality of Service Response Team 
Antivirus Solution Manager / SPAM Control Team Assistant
ghillstomerpostmaster.co.uk