What’s inside:

How spam filters work and how to avoid them. Tips include:

  • What is spam?
  • How spam filters work
  • Preventing false abuse reports
  • Email firewalls

Legitimate email marketers who send permission-based emails to people who requested them get spam filtered all the time. Unfortunately, there’s no quick fix. The only way to avoid spam filters is to understand what spam is and how the filters work. This guide gives you the rundown.


By now, most email marketers know that spammy phrases like “FREE! CLICK NOW!” will trigger spam filters to flag their message. But before an email even gets to that filter, it first has to pass through a gatekeeper or "firewall." (Yep, spam is now such a problem that spam filters now need filters of their own.)
Read Online

Download the guide in PDF, ePub, and mobi formats.