Sort version:

Is there a firewall / router that will check incoming requests on port 25
against a list of RBLs and reject the ones that are listed? Preferably with
a message about RBLs and how to get off them.

Long version:

I'm getting buried in spam.

No surprise considering how many public email addresses I have.

I have some pretty good spam filters and I use the RBLs via software on the
POP3 side. It helps a lot and things are more or less livable.

But I would really like to move the RBL blocking to the /other/ side of the
email server: On the internet side of the server. Two reasons:

A) That way the server doesn't have to store and POP3 the spam and it can
instead be dumped before it even gets to clients. 

B) So that any false positives know that their email was rejected.
Hopefully, along with a quick explanation of why and some advice on how to
fix it or a link to a web contact form if they can't.

Now there are undoubtedly many fine email server programs that will do just
that but I don't really want to install and learn a new one at this time. 

I've found a program that can perhaps be installed on the server and setup
to pick up connections on some port other than 25 (port forwarded by the
router) and then send them on to port 25 on the same server if they pass.
E.g. the router would forward 25 to 2525 and this software would pick up
those requests, check them against the RBLs and then forward them to
127.0.0.1:25 if they pass.

But it seems like that is a function that would fit very nicely into a
firewall or router. I'm less than impressed with the one that I have now and
I'm wondering if I can kill two birds with one stone.

Thanks for your advice.

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