mail filtering based on reverse DNS (was: Re: IPv6 Hackers mailing-list)

[Bjoern A. Zeeb]

On Aug 9, 2011, at 4:17 PM, Bjørn Mork wrote:

> Anyway, if you reject mail from IPv6 addresses without reverse DNS
> today, then you are guaranteed to reject legitimate mail.  One might
> even question the usefulness of reverse IPv6 DNS as a low score spam
> rule.  There are just too many matching legitimate sources.

If one operates a legitimate mail server and is unable to provide any reverse
mapping for the v6 address I seriously do not care to not accept his email as
it's clearly not operated in a professional manner.

That said, yes people are sending Email from Teredo addresses, etc.
Yes, it's spam.

/bz

-- 
Bjoern A. Zeeb                                 You have to have visions!
         Stop bit received. Insert coin for new address family.