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Free tool

Free email spam checker. Will yours read as spam?

Paste it and see: spam words highlighted by category (urgency, shady, overpromise, money talk, unnatural), plus the structural checks: length, caps, links, subject line. Instant checks never leave your browser; when you want a second opinion, the deep check returns a real SpamAssassin spam score.

Content score

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Paste an email to score it

Deep check

Score this draft with SpamAssassin, the open-source filter real mail servers run. Below 5.0 passes; lower is better.

This one check sends your draft to the scoring service (Postmark SpamCheck). Scored and discarded, never stored.

Content is one deliverability factor, and not the biggest one. Domains, warmup, volume, and list quality decide whether you reach the inbox at all; this checker keeps the copy from making things worse.

Next: Check Your Sending Domains →Have Us Write the Whole Campaign →

How it works

What does this checker actually look at?

It scans your subject line and body against five categories of trigger language: urgency and pressure, shady and evasive phrasing, overpromises, heavy money talk, and unnatural salesy filler. It highlights every match in context so you can rephrase it, not just delete it.

Then it checks the structure filters care about: total length (cold emails work best around 125 words), ALL-CAPS shouting, exclamation marks, link count, faked "RE:" subject lines, and whether your subject fits in the ~55 characters people actually see.

And when the copy looks clean, run the deep check. It puts your draft through SpamAssassin, the open-source filter many mail servers actually use, and returns its real score with the exact rules you tripped. Most paste-in checkers only match word lists; this one shows you what a filter would do.

One honest caveat, because our whole business is getting emails delivered: copy is the smaller half of the story. If your sending domains are burned, perfect wording changes nothing. Run the domain health check next.

FAQ

Spam checker questions.

Is this spam checker really free?
Yes: no login, no email required, no limits. The instant checking happens entirely in your browser; your email text is never uploaded or stored. The optional deep check sends your draft to the scoring service once, returns the score, and discards it.
What is the deep check, and what is a good SpamAssassin score?
The deep check runs your draft through SpamAssassin, the open-source filter that many real mail servers use to junk email, via Postmark’s free SpamCheck service. SpamAssassin scores in points, and lower is better: under 3.0 is comfortably clean, 3.0–4.9 is borderline, and 5.0 or higher gets flagged as spam by default installs. It also lists the exact rules your email tripped, so you know what to change.
Will fixing spam words guarantee I land in the inbox?
No, and be suspicious of any tool that says otherwise. Whether you reach the inbox is decided mostly by your sending setup: your domains, warmup, volume, and list quality. Clean copy keeps the content from making things worse. It cannot rescue a burned domain.
What counts as a spam trigger word?
Words and phrases that appear constantly in junk mail and rarely in real business email: pressure phrases ("act now"), evasive ones ("this is not spam"), overpromises ("100% guaranteed"), heavy money talk, and salesy filler ("click here"). Filters learned these patterns from decades of spam; buyers learned them too.
What is a good score for a cold email?
85 or above means the copy itself is clean. Below 70, the wording is actively working against you. Either way, keep the email under about 150 words, one link at most, no ALL-CAPS. And remember the score reads your copy, not your sending reputation.
Does this work for cold email to commercial clients?
It was built for exactly that: outreach from service companies to property managers, facility managers, and business owners. The word lists and checks reflect what we see running real campaigns, not consumer newsletter rules.

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