Article

How to reduce and fix email spam complaints

Postmark Free Intermediate

Spam complaints are the signal that actually poisons a domain, more than any single email landing in a spam folder. This piece explains what a complaint rate is, how mailbox providers use it, and concrete ways to keep it low. Read it once you have SPF, DKIM, and DMARC set up and want to protect the reputation you just built.

  • A complaint rate above roughly 0.1 percent starts hurting your sender reputation
  • Make it obvious who you are and why you are emailing, confusion drives complaints
  • Monitor complaints per domain, not just overall, so one bad list does not sink everything
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The question it answers

  1. My cold emails keep landing in spam. How do I fix deliverability?

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