Email Deliverability 7 min read Aug 25, 2026

SpamAssassin Scoring & Tuning: Optimizing Email Content & Headers to Beat Spam Filters

Published by ZodHost Engineering Team

Executive Summary & Key Takeaways

Understand how SpamAssassin evaluates spam scores and how to optimize MIME structures, plain text alternates, and email headers.

How SpamAssassin Evaluates Incoming Messages

SpamAssassin runs hundreds of heuristic tests against incoming email headers, MIME structures, and message bodies, assigning positive (spam) or negative (clean) points.

Tags: #SpamAssassin scoring #reduce spam score #email header optimization #HTML email deliverability #stop spam trigger words

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