Everyone who sends email has to be very careful about upsetting email service providers, because they&#x27;ll mark your messages as spam if they suspect you of misbehavior. Email providers use many metrics, and one of them is the number of bounced emails.<p>It doesn&#x27;t take much to be marked as a bad actor, so companies will quickly remove you from their lists if you&#x27;re jeopardizing their ability to get into the inboxes of their other users.<p>Source: I&#x27;ve worked at a couple of companies that used email as a significant part of their strategy to keep in touch with users.