[cobalt-users] Receive mail ONLY from specified networks?

[Michael <mike@xxxxxxxxxx>]

Hello all!

I have recently launched a war on spam on my server.  I first disabled all the catch-alls, and now we use pre-determined email address.  I am about to change them all and send out notices. (private raq4, not hosting others sites).

I have a problem with networksolutions though.  I have a email address that I set with them, but others have I guess, "farmed" it off of their whois database.  Instead of changing this address, only to have it farmed and spammed again, is there a way on the raq4 to SHUT OFF the public from sending to an email address and just enter the place you want to receive mail from?

In other words, I WANT blah.blah@xxxxxxxxxx to RECEIVE mail from networksolutions, but nobody else.  However, I dont want this to be global, in otherwords, mike@xxxxxxxxxx should still receive the whole world...

Can this kind of reverse filtering be done?  I think it can VIA procmail, BUT the reason for this is to claim back the bandwidth spammers are using.  I realize it is not much bandwidth, but its just the point.  I pay for my bandwidth and I don't want to accept a data-socket from a spammer, even if procmail is just throwing it to the trash!  Of course, this might be my only way to pull this off...

Any ideas?

Thanks

Mike