

That’s probably just mail that lands in your spam folder without being entirely blocked. According to Microsoft and Google approximately 99% of incoming spam (of the ~160 billion spam emails sent per day) never even reaches their users mailboxes. I assume that’s roughly standard across email providers. I am concerned comparably sophisticated filtering may become necessary on the Fediverse eventually.
This is Marketplace with Dave Smith Aperiodic Monotile Schuldiner.