Highlight every spam-trigger word in your email — inline.
Paste your draft — subject + body, anything you want. Trigger words get highlighted inline so you can rewrite them in context. No backend round-trip; everything runs in your browser.
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Mailbox providers don't just look at where mail came from (SPF / DKIM / DMARC) — they also score what's in it. The Bayesian filters Gmail, Outlook, and Yahoo all run since the early 2000s correlate certain words with spam at population scale; messages with too many of those words land in the spam folder regardless of how well-authenticated the sender is.
No single word fails an email on its own. It's density that matters — a cold-outreach email mentioning "free trial" once is fine, an email that says "FREE OFFER — ACT NOW — LIMITED TIME — CLICK HERE" lights up every filter on the planet. The category breakdown surfaces which mode of spam your draft most resembles (urgency, sales, financial, …) so you can fix the dominant signal first.
This tool is only the content side. For the full picture you also need a clean technical posture (SPF + DKIM + DMARC) and a warm sender reputation. Even a perfectly-written email lands in spam from a cold mailbox — that's what mailbox warmup tools fix on the other side.
The word list errs on the side of false-positives because borderline phrases stack: one or two are fine, but if your draft has ten you've probably written something that pattern-matches a spam template even if the intent is legitimate.
High = phrases that score heavily on every major filter ("viagra", "make money fast", "act now"). Medium = phrases that score with context. Low = generic sales language that's only a problem at density.
No — only word patterns. The full spam checker at /tools/email-spam-checker also scores link density, ALL CAPS, excessive punctuation, image-heavy mail, URL shorteners, and a few other heuristics.
No. There's no canonical list — every mailbox provider tunes their own. This list covers the words that show up on every public spam-trigger list (SpamAssassin, HubSpot, Mailchimp, Sendinblue). It catches ~80% of common offenders.
Content checks help, but the real test is whether mailbox providers actually place the message in the inbox. SieveGuard's Inbox Placement add-on sends seed emails to Gmail, Outlook, Yahoo, ProtonMail, and GMX and reports inbox vs spam vs missing per ESP.