If all dynamic clients are not allowed to send SMTP from anything but the ISP server with outgoing spam filtering, SMTP auth without allowing forged return addresses. If AOL and other ISP companies log the amounts of client emails outgoing they could easily identify which clients are sending bulk email. Looking at it from the receiving perspective is way different than looking at it from the sending perspective, as you already well know anyway.
In the list you provided there is no way to know for sure how many of the ones that have AOL return addresses have been forged. My guess is that a good majority of those with AOL return addresses are forged. >From my own research I am finding that most of the IP addresses that send spam are all coming from the same ISP companies. A really large percentage of them have forged return addresses and other characteristics that would make it easy enough for an ISP to easily identify. While this wouldn't stop all of it, it would certainly stop a large percentage of it and force the spammers to properly identify themselves. With that much solved it would be easier to filter what you don't want at the receiving end of it all. I see lots of people arguing why this will not work, perhaps if this energy was focused on what would help and passed to the Feds to create laws to force it, we could really make a difference! It sounds more logical to me than trying to attack what's already pretty strong. In many wars the key to victory is first cutting off the supply lines. <snip> example, from one MX for 24 hours yesterday, the qty of SMTP session per domain.tld: <snip> To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
