First, most of your message has a lot of misconceptions about dynablock, and SA's use of it. It's also very long so, I'm just going to leave it out, and reply to your points of confusion free-form.

Dynablock does not block spamsources. It lists the IPs of dialups, cablemodems, and DSL, regardless of wether or not they've sent spam before or not. Period. See http://basic.wirehub.nl/dynablocker.html

The purpose of dynablock is to block those users who do not send mail via their relay. It is not intended to be used to block dialup users that do send via their proper mail relay.

SA should be checking every IP except the first IP in the received chain. It should skip the very first IP, so that it does not check the hand-off from their machine, to their ISP's mailserver. If you've got an example where it has in fact checked the first IP (despite the code explicitly avoiding doing so) then there's a bug in SA's handling.






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