As a user, I pay my ISP to forward IP packets. If there happen to be TCP segments in those packets, that's something between me and the person the packet is addressed to, ...
...and, occasionally, your ISP's "abuse desk." If this function of your ISP costs less than 1 FTE per 10,000 dialups or 1,000 T1's or 100 T3's, then your ISP is a slacker and probably a magnet for professional spammers as well. If they want to do some simple things to keep the "slacker" cutoff point at those numbers rather than other numbers which are 90% smaller, you'll understand the economics. If one of those simple things is blocking outbound TCP/25, then I hope you have alternatives including changing ISP's... ...but if you don't, then it's between you and your ISP, and best of luck. -- Paul Vixie