Modern spam filtering is not purely based on white/black-lists. Statistical analysis of the content is performed.
You don't need to auto-spam-box sources that are sending low volume emails to the same set of addresses, especially when the messages don't get categorized as spam by the content analysis.
You don't need the kind of global coordination you are talking about. Further, whitelists don't solve the problem. Under your scenarios, you can just as easily receive low volume spam from millions of fake accounts at the big providers. You're just relying on the provider to solve your spam problem.
Sorry, but these claims just demonstrate that you have not operated a large volume mail servers.
Yes, most of us do need to automatically block such sources because content analysis does not do a good job, and experience demonstrates that the vast majority of such messages are still spam.
> You're just relying on the provider to solve your spam problem.
Yes, we are. And you should be extremely happy they put in the effort they do, or your e-mail would be completely useless.
> Modern spam filtering is not purely based on white/black-lists. Statistical analysis of the content is performed.
Not purely, no, but content analysis is typically performed after whitelist/blacklist checks. If a host connecting to my mail servers is on a blacklist, there is no content analysis because the mail will be rejected before it gets that far.
You don't need to auto-spam-box sources that are sending low volume emails to the same set of addresses, especially when the messages don't get categorized as spam by the content analysis.
You don't need the kind of global coordination you are talking about. Further, whitelists don't solve the problem. Under your scenarios, you can just as easily receive low volume spam from millions of fake accounts at the big providers. You're just relying on the provider to solve your spam problem.