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What is happening is your ISP has a poorly configured mail server, acting as an open mail relay. Usually, a server is set up to deliver mail into or out of a domain. Either the sender or a recipient is a user on the system.
An open relay will accept mail from and deliver mail to users outside the domain of the server. This is how most spam is sent.
As a way of preventing spam, some companies subscribe to a service that blacklists open relays, and refuses any mail from a server that is an open relay.
If your ISP doesn't have an open mail relay, they don't get blacklisted. As I understand it, they only get reported to a blacklist company, if they have sent spam and someone complains. It is likely that some of the penis enlargement/refinance/viagra/Paris Hilton sex videos that have been filling up my spam filter (about 8900 since Monday morning) came from your ISP.
You need to complain to your ISP. This is their problem, not yours, and they should fix it.
The $50 thing is a little wierd. Most of the time, you just fix the open relay, and notify the blacklist and they remove you.
Tom
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