Re: [Exim] New Metod to Control SPAM : Mail Online Listing

>If they're doing this, then the mail servers which belong to the victim's
ISP are completely out of the loop and can't do anything about the volume of
mail going out.

More and more ISP's have started to block all egress traffic on port 25. You
_have_ to use their servers (ok ok, or have a smarthost outside their net on
a nonstandard port, or VPN, or...). All four of the "major" providers in
sweden have done this.