[Trilug-ontopic] mailing list server filtering setup questions

[Brian McCullough]

On Thu, Dec 20, 2007 at 11:54:05AM -0500, Cristóbal Palmer wrote:
> What would be a decent workaround for this? Say maybe something like...
> 
> lists.example.org.       IN       MX       5 list-filtering.example.org.
> lists.example.org.       IN       MX       6 foobar.example.org.
> lists.example.org.       IN       MX       10 lists.example.org.
> 
> Where foobar is a server set NOT to respond AT ALL. Stupid? Workable?
> Bad netizenship?

But what the others said was that they spammers would look for the
LOWEST, which in all of your examples is the unfiltered machine.  We
strongly recommend that you NOT expose your unfiltered machine in any
way.  

As far as filtering goes, Postfix first checking for valid sources
( various ways to do so ), dropping any junk on the floor ( or
appropriate equivalent ), passing the mail on to ClamAV, and then
finally on to Spamassassin ( or your choice ), before passing the valid
mail on to further processing.  As long as Postfix is properly refusing
connections from junk sources, your machine should be sufficient for
this role.


Brian