said by NormanS:It would cost Comcast less to just block outbound port 25 than to spend a wad of money on monitoring hardware which, by my MTA logs, doesn't seem to be working, anyway; assuming that they are employing Sandvine boxes to monitor SMTP traffic.
If you look at what sandvine product can do it's more than just detect outbound spam. It appears to be more of a general purpose firewall that can do deep packet inspection and take action on what it finds, be that P2P use or outbound spam or a worm.
I will say this however, the behavior of bittorrent on my end has changed within the last month. It seems to take longer to get started and as I look at the list of peers right now it shows all peers I'm connected were inbound connections. That doesn't prove anything (it could just be that I've had the torrent running long enough that new peers find me before I find them) but I have noticed a bit of a difference.