Allegedly, Microsoft subscribes to random spam checklists like UCEProtect. uceprotect bans entire subnets & ASNs if just one IP is suspected of sending spam.Ap

Allegedly, Microsoft subscribes to random spam checklists like UCEProtect. uceprotect bans entire subnets & ASNs if just one IP is suspected of sending spam.Apparently, you can pay to get your IP whitelisted for some time but it will be back on the list again. Its probably a scam/shakedown operation. As these lists discourage self-hosting and benefit large email providers, they take their own time for fixing these issues.