I've been noticing a lot of spam coming in to users on my qmail
server from popsite.net addresses. I guess they're just a big dialup
provider that obviously lets their users relay whatever they want
through their server. But anyway, the Helo, From, To, and Return-Path
are all garbage. The only thing that is consistent across emails is the
path it took to get to me, and it always starts with a popsite.net address.
I tried to put @popsite.net in my badmailfrom but that didn't work.
Is there any way to block all popsite.net connections? They always seem
to come from different addresses and subnets.