From: Robert Schetterer (robertschetterer.org)
Date: Mon Mar 03 2008 - 16:09:06 CST

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Gerard schrieb:
> This question came up on another list. In regards to RFCs and PTRs, is
> there any requirement that prohibits the blocking of connections from
> hosts that lack PTR records, or that recommends that they should be
> accepted?
>
Hi,
what you mean exactly with lack PTR, something like
reject_unknown_reverse_client_hostname ?
I may fail but i think this parameter breaks rfcs
but i use it on all my mailservers without
any big problems so i would recommend it.
Some big providers use it too, like
gmx
http://faq.gmx.de/optionen/email/antispam/4.html
( sorry dont found it in english )
In one year of using it, i had only a few
requests to debug ( whitelist ) ips with it

--
Best Regards

MfG Robert Schetterer

Germany/Munich/Bavaria

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