Russell L

If you insist on using Microsoft, but want to avoid landing in the SpamCop blacklist when Microsoft doesn't police their network, you could always utilize an outbound connector so that your email is delivered from another network/service - which one you choose, is up to you: https://learn.microsoft.com/en-us/exchange/mail-flow-best-practices/use-connectors-to-configure-mail-flow/set-up-connectors-to-route-mail#2-set-up-a-connector-from-microsoft-365-or-office-365-to-your-email-server

So, because *Microsoft* decides to mix your legitimate email with a large volume of spam email, and refuses to stop the spam coming from their network, you think the problem is with SpamCop? Only Microsoft can police their own network, and they are basically refusing to do so. You can always take your email someplace that knows how to behave.

Microsoft mail servers are actively being abused to send out a large volume of spam to the Internet (mixing your legitimate email with spammers). Microsoft tells you "not our problem, call spamcop"? Hah!

That's not its only purpose, though trust me, it most definitely is stopping spam. Spamcop simply lists IP addresses that are actively sending spam, that's it, and it's working perfectly in that regard. I, personally don't wish to receive mail from systems actively being abused to send spam. Whether I choose to block communications from them, or just add a warning to an email is up to me. If you don't want to be impacted by such abusive behavior while sending mail, you can always choose not to put your email on a service that is abused without regard for the rest of the Internet.

The ONLY problem here is that Microsoft is not stopping the abuse of their mail servers to send spam. Take your issue up with Microsoft. Spamcop is working exactly as it is supposed to. Only Microsoft can fix this.