Find spam triggers
before your email lands.
A free spam word checker for cold email teams, just paste your subject line and body, get an instant deliverability score.
Tip: the score is a starting line, not gospel. Words are one signal of many. Sender reputation, authentication, and prior engagement usually matter more.
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How spam filters actually work
Modern inbox providers do not block on a fixed list of words. They score every message across hundreds of signals, then drop low-scoring messages into spam, promotions, or quarantine. Words are one signal of many. Domain reputation, authentication (SPF, DKIM, DMARC), prior engagement, and sending volume usually matter more than copy alone.
That said, certain phrases stack the deck against you. Words associated historically with mass marketing, lottery scams, and weight-loss spam still carry penalty in 2026, especially in subject lines. Eliminating obvious triggers is a cheap, fast win before you ship a sequence.
Subject lines weigh heaviest
A spammy subject is enough on its own to send a clean body to junk. Keep subjects short, lowercase, specific to one person, and free of "free", "guaranteed", and exclamation runs.
Stylistic signals count too
ALL CAPS, !!!, $$$, and runs of currency or punctuation symbols are flagged as readily as the obvious phrases. The checker scores these alongside the word list.
Use this as a triage step
If your score is below 75, rewrite. Above 90 and you're clear on the copy axis. The remaining work is on the deliverability stack: warm domains, inbox placement testing, list hygiene.
Links and images add weight
Every link, tracking pixel, and embedded image is another signal a filter reads. One clear link to one destination beats three. Plain-text-style emails clear filters more reliably than heavy HTML or image-only sends.