Free Cold Email Spam Trigger Checker
Paste your cold email draft and instantly surface the spam trigger words that send it to junk. Works on subject lines and body copy — for Gmail, Outlook, and Yahoo filters.
500+ flagged phrases. No signup. Copy stays in your browser.
What This Spam Trigger Checker Flags
The tool scans your subject line and body copy against a curated list of 500+ phrases that Gmail, Outlook, and Yahoo spam filters weight heavily. Categories that get flagged:
Money & Finance Triggers
"$10,000", "earn extra cash", "financial freedom", "lowest price", "bad credit" — any phrase that reads like a Nigerian prince email or a payday loan.
Urgency & Pressure
"act now", "limited time", "don't delete", "expire", "urgent". These telegraph "marketing blast" to classifiers — even when they're legitimate.
Guarantees & Hype
"100% free", "guaranteed", "amazing", "incredible deal", "miracle". Words that are inherently too-good-to-be-true.
Formatting & Punctuation
ALL CAPS phrases, multiple exclamation marks, dollar signs, and percentage symbols in the subject line — all weighted negatively regardless of context.
How to Rewrite Flagged Phrases
Most spam triggers have a direct, non-triggering rewrite. A few patterns that work across US B2B outbound:
"100% free trial — act now before this offer expires!"
"Open to a 15-minute audit of your current outbound setup?"
"Guaranteed to double your revenue in 90 days"
"One of our recent clients added 23 meetings to pipeline in 60 days — happy to share the playbook"
"Cheap SEO services — lowest price, no obligation"
"Quick question about {{company_name}}'s organic traffic strategy"
Want 27 cold email subject lines that work without triggering filters? Read our subject lines guide.
Why Copy Matters Less Than You Think
Here's the honest truth most cold email tools won't tell you: a perfect spam-free draft sent from a misconfigured domain still lands in junk.
Gmail's spam classifier weights sender reputation far more heavily than content. If your SPF, DKIM, or DMARC is broken — or your domain is unwarmed — cleaning up "free" and "guarantee" from your copy won't save you.
Run this tool to polish your draft. Then run the DNS checker to verify your infrastructure. Copy is the 20% fix; infrastructure is the 80%.
Frequently Asked Questions
Will my cold email go to spam if I use flagged words?→
Not necessarily, but the likelihood increases. Spam filters use scoring systems — a single flagged word with otherwise good infrastructure may still land in inbox. Multiple flagged words or one high-weight phrase (like "100% free") combined with weak sender reputation almost guarantees spam placement.
Is this tool accurate for Gmail specifically?→
Yes — the flagged word list includes phrases specifically weighted by Gmail's Bayesian filter. Google doesn't publish their exact spam scoring algorithm, but the patterns in our list are the ones that consistently cause placement drops in our client testing.
Does my copy get stored when I use this tool?→
No. All analysis happens in your browser client-side. Your email content never touches our servers. You can paste sensitive copy safely — nothing is logged or stored.
What score should I aim for?→
Above 80 is a safe grade. Below 60 means the copy has enough triggers that even good infrastructure won't save it. Between 60–80, rewrite the flagged phrases the tool surfaces before sending at volume.
Can I use the same email across industries?→
This tool catches universal spam triggers, but different industries have different context-specific red flags. Financial services has stricter filtering around money phrases; healthcare has stricter filtering around medical claims. Always tailor copy to your ICP.