Filter Testing & Diagnostics

How to "see" what the filter sees. This section covers how to use seed list" testing (sending your email to a list of test accounts) to "see" if you are landing in the spam folder at Gmail, Outlook, etc., before you send to your real list.

12 questions in this topic

How can you test spam score before sending? What tools measure content and header compliance? What is seed list testing for inbox placement? How to interpret GlockApps, Mail-Tester, or Postmaster results? What’s the difference between spam score and placement test? What is fingerprint matching and why does it matter? How to test for blocklist impact on inboxing? How do you identify which layer blocked you (ESP, ISP, filter, recipient)? How to use SMTP logs for spam-filter diagnosis? What is “reputation isolation” testing? How can test sends backfire if overused? What are signs you’re triggering user-level filters?

Questions about Filter Testing & Diagnostics