> A professional ISP does not block any port. Blocking ports > can only be done on the customer side. The ISP does not know > which port i might need.
This isn't about you. The ISP also has a responsibility to protect the internet at large. If millions of spam are sent each day because the average user is too stupid to close off his proxy, then the ISP can either shut him down, or block the proxy port. Obviously, shutting down isn't an option for business reasons.
In this case I would request all ISPs to block port 25. Millions of spams are sent via this port each day.
Nils
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