Peter Duniho wrote:
Darrel Toepfer wrote...

Blocking the dialup/cable/dsl modem pooled IP's of another ISP are the
necessary evils of being an ISP.

No, they are not. Not when the ISPs being blocked are actively anti-spam.

There is no valid reason to allow dialup accounts to send SMTP direct.
Route the mail through the provider's server, works for millions of
other people...