mail filtering based on reverse DNS

[Ignatios Souvatzis]

On Wed, Aug 10, 2011 at 01:19:20PM +0200, Bjørn Mork wrote:

> rev(A) != PTR
> rev(AAAA) != PTR

In the modern days, where often a lot of services *with their own
domain names* run on big server machines, it is unreasonable to require
that forward and reverse resolving agree. (The SPF stuff might be 
a more reasonable assumption, but the most thorough implementors are
the spammers, afaik.)

Requiring any PTR might be ok.

	-is