How Modern Spam Gateways Evaluate Cold Outreach Copy
Modern mail filtering systems (such as SpamAssassin, Google Workspace, and Microsoft Defender) use heuristic algorithms combined with Bayesian probability engines. When an email contains multiple words historically found in junk folders—especially when paired with aggressive capitalization or excessive symbols—its deliverability score drops sharply.
1. Maintaining Low Spam Trigger Density
Using a single phrase like "free" will not instantly condemn your message to junk if your sender domain is authenticated (SPF, DKIM, DMARC). However, clustering multiple trigger words ("100% free guaranteed profit act now") pushes the message over algorithmic spam thresholds.
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Frequently Asked Questions
Is my email copy saved or uploaded to external servers?
Never. All keyword evaluation, formatting regexes, and spam calculations execute 100% locally in your device's browser memory (RAM).
What is a good spam score to aim for?
Aim for a Spam Score below 15% (Clean). A score above 30% indicates severe deliverability risks that may trigger junk folder routing.