This same effect is in use through our email system. If you send heaps of email to each and every big provider (100 per day to even be registered by Microsoft's

This same effect is in use through our email system. If you send heaps of email to each and every big provider (100 per day to even be registered by Microsoft's Outlook servers) then you can do something about no longer being sent to the spam folder automatically. However if you're like Silent Bob and send out very few emails from your own self hosted server, you always get treated as though you're the next source of a major spam attack, despite having the same server and same email send rate for a decade. As a dev I understand how this happens: it's all too easy to filter out the statistically insignificant. But we shouldn't.