Dns-operations mailing list

[Quinn Wood <wood.quinn.s AT gmail.com>]

On Thu, Feb 13, 2014 at 6:20 AM, Peter Green <peter AT greenpete.free> wrote:
> If T2's could automatically blacklist abusive I.P.s and submit those I.P.s
> to a list, I think that would work in a more open way.
>
This has been attempted in numerous ways, all of which the attacker
knows about. Which means changing one byte bypasses them.

> I think some, but to the point very few mail providers insist on white
> listing addresses, and it just doesn't work out, but blacklisting, to a much
> greater extent does.
>
You can't be expected to know who will send you mail. You can be
expected to know who will use your phonebook.