Dyonisius Visser:
> Hi guys
>
> At the moment we use local spamfiltering on our MX smtp.terena.org.
>
> I would like to test out a new mail filtering product, which is a hosted
> solution. This system is configured to accept mail for our domains, and
> deliver it to smtp.terena.org.
> Eventually if this filter is deemed OK then our MX records would point
> to those boxes.
>
> For testing, I would like to have incoming mail for some users
> (including me) to be delivered to this remote filter. This could be
> achieved by transport maps such as:
>
> vis...@terena.org smtp:remote.filter.box
That does not work, because the filter almost certainly must talk
to the remote SMTP client directly, so that it can do client IP
address reputation stuff.
Besides, it is a bad idea to use the same primary MX address AND port
MX for unfiltered mail and for re-injected mail. Postfix describes better
options in the MULTI_INSTANCE_README.html file.
/-----------\
primary MTA with transport map < > back-end MTA
\---filter--/
But, this means the filter won't see the client IP address and
will therefore not be as effective.
Wietse
