More helpfully, salting their db with real emails but fake contact info requires a more durable hygiene process and often isn't worth the effort for data driven

More helpfully, salting their db with real emails but fake contact info requires a more durable hygiene process and often isn't worth the effort for data driven shops. You serve a variety of email domains that validate as deliverable, then you accept emails and report the sender, which hurts their deliverability.