Cold Email Spam Checker
Paste your email, get an instant spam score with every risky word highlighted, plus fixes. Built for cold outreach: subject line, personalization, length and links all checked. Runs in your browser; nothing is sent anywhere.
✓ 100% in your browser, we never see your email · ✓ Unlimited free checks · ✓ Cold-outreach specific
How spam filters actually judge your email
Modern filters at Gmail and Outlook don’t block emails over one bad word, they add up signals. Spammy phrases, shouty formatting, too many links, a me-me-me pitch, a missing unsubscribe story, a new domain, each adds weight. Cross the line, and you’re in spam. That’s why this tool doesn’t just find “free” and “guarantee”: it scores everything filters actually weigh in cold email, subject length, personalization, link count, capitalization, and the words themselves, grouped by why they’re risky.
The five kinds of risky words
Urgency (“act now,” “last chance”) pressure tactics filters associate with scams. Money (“earn cash,” “no fees,” “$$$”) the oldest spam category there is. Overpromise (“guaranteed results,” “risk-free,” “#1”) claims that sound too good because they are. Shady (“this isn’t spam,” “not a scam,” “confidential offer”) phrases that protest too much. Salesy (“buy now,” “exclusive deal,” “limited offer”) fine in marketing blasts, deadly in cold outreach where you’re pretending to be a human, not a campaign.
What a good cold email looks like by the numbers
From thousands of our own outreach campaigns: 50–125 words in the body, a subject under 60 characters, one link at most, at least one question, real personalization in the first line, and more “you” than “I.” None of that is magic, it’s just what a real one-to-one email looks like, and looking human is the entire game. Our checker scores your email against every one of these.
Words are only half the battle
An honest note most tools skip: content is one signal among several. If your domain is missing SPF, DKIM and DMARC records, if you’re blasting from a brand-new domain with no warmup, or if your list is full of dead addresses bouncing back, no amount of word-polishing saves you. Clean copy plus a clean list plus a warmed domain is the full formula. For the list part: verify your emails free with our email verifier before you hit send, bounces hurt your sender reputation more than any spam word.
Frequently asked questions
Is this spam checker really free and unlimited?
Yes, completely free, no sign-up, no limits. It runs entirely in your browser, so there’s no server cost for us and no privacy worry for you.
Do you store or read my emails?
No, and unlike most tools, we technically can’t. The whole check runs in your browser with JavaScript; your text never leaves your device. Close the tab and it’s gone.
Will removing spam words guarantee I land in the inbox?
No, and don’t trust any tool that says yes. Content is one signal; sender reputation, domain authentication (SPF/DKIM/DMARC), warmup, and list quality matter just as much. This tool fixes the content signal, pair it with a verified list and a warmed domain for the full picture.
What’s a good spam score?
80+ means your copy is clean, send it. 50–79 means a few fixes will meaningfully help. Under 50 means the filters will likely notice; rewrite the flagged parts and re-check. One flagged word rarely matters, clusters do.
Why does it check my subject line separately?
Because filters and humans both judge it separately. The subject decides whether your email gets opened, and it’s the most heavily weighted line for spam signals, caps, exclamation marks, spam words, and length over ~60 characters all hurt more there than in the body.
Why does the tool care about “you” vs “I”?
Cold emails that talk mostly about the sender (“I wanted to reach out, we offer, our company…”) read as pitches, to humans and, increasingly, to engagement-based filtering. Emails centered on the recipient get more replies, and replies are the strongest positive signal your sender reputation can earn.
How many links should a cold email have?
One, ideally, or zero in a first touch. Every link is a signal, and multiple links in a short email is a classic spam pattern. Save the calendar link for the reply.
Which providers’ filters does this reflect?
The patterns here are the common denominators across Gmail, Outlook and Yahoo: trigger vocabulary, formatting signals, and structural red flags. No external tool sees inside any provider’s exact algorithm, anyone claiming to is guessing with confidence.
Why is a link building agency giving this away?
Because outreach is our day job, we send thousands of pitch emails a month to editors, and every lesson in this tool came from that. If your outreach is for link building and you’d rather someone else do the pitching that’s literally what we do.