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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Reverse DNS and SMTP
Patrick Muldoon <[email protected]> said: > > 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. To be honest, I would do this as a last resort. For example, if their ISP's (or their own, if they have the block delegated) DNS server is misconfigured, etc, you might have a issue. Also, some admins have no clue what reverse dns is, seriously :). I would use a service like MAPS first to see if that resolves the issue, and use this as a last resort. If they don't have an issue with blocking unresolvable ips, then they shouldn't have an issue with just using an rbl ;). --conradr
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