Re: [OT] recomended DNS services?

[Andy Davies <dajdavies@xxxxxxxxx>]

K. C. Li wrote:
> On Tue, 25 Apr 2006, Paul Gale wrote:
>
>
>> How would having a backup mail service (incoming) open me up to
more
>> spam - are you talking about incoming or outgoing from me? It
would
>> all come through my server and would be picked up in the same way
as
>> it does now wouldn't it?
>>
>
> Normally, the secondary e-mail server would have been authenticated
(or
> the fact that it is an intermediate forwarding point) and thus bypass
some
> or all the UCE checks on the primary server. That is when spam would
slip
> through if the secondary is less stringent than the primary in terms
of
> UCE vetting.
>
> Even if you treat the secondary server like any other incoming server
> delivering e-mail, there are some effective UCE tests that could only
> apply to directly connected incoming e-mail servers. For example, RBL
> (Realtime spam Block Lists) checking would be useless because you
would be
> checking the secondary's IP address and not the real originating
e-mail
> server's. Other effective anti-UCE measures such as greylisting,
reverse
> DNS lookup, SPF, etc would also be rendered useless by the seconadry's
> route.
>
> Of course, if you currently don't do any of those UCE tests on your
> primary e-mail server, you would have noticed no difference by adding
the
> secondary.
>
Unless you operate the backup mailserver yourself, it seems a case of
damned if you do, damned if you don't use the mx backup then?

Andy