who is using require_rdns.m4?

[Scott Silva]

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Steffan Henke wrote:
> On Mon, 6 Jun 2005, Jeff A. Earickson wrote:
> 
> 
>>There was a thread a while back "block emails with no valid reverse DNS",
>>and one of the options was Neil Rickert's require_rdns.m4 hack for
>>sendmail.  I'm wondering how many people out there use this successfully?
> 
> 
> We are happily using it for a couple of months now. Mails from hosts 
> without reverse DNS are rejected with an error message so the user knows 
> that his email has not been received.
> I think this is a fair behaviour. When I look at the logs, most of the 
> rejected hosts are spam sources from either Korea or Brazil.
> If I'm not mistaken, AOL dumps email from hosts w/o PTR records to 
> /dev/null.
> 
> Regards,
> 
> Steffan
> 
The last time I got one, AOL still was notifying. Took me a week with
MCI to get that straightened out.

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