All tools
Blacklist & DNSA free tool by NullFortis
Spam Words Checker
Flag spammy wording
What is it?
Certain words and phrases — "act now", "100% free", "risk-free", exaggerated urgency — are heavily weighted by spam filters because they show up disproportionately often in actual spam.
Why it matters
Content filtering runs alongside authentication checks: a perfectly authenticated, SPF/DKIM/DMARC-passing email can still get spam-foldered on wording alone.
Impact if ignored
Overusing trigger phrases can quietly suppress an otherwise legitimate campaign's inbox placement, especially for cold outreach and promotional email.
Common use cases
- Review a subject line and body before a large send
- Compare wording across draft variants
- Teach new copywriters what filters tend to flag