Paste your email subject line and body below. Our analyzer scans your copy in real time against 200+ spam trigger phrases across 4 risk categories (Urgency, Financial, Overpromise, and Shady/Formatting) and suggests clean alternatives.
Spam filters evaluate two things on every campaign: what you write (content score) and who you send to (sender reputation). Even if your email copy has 0 spam words, sending to invalid or disposable email addresses triggers hard bounces that push your entire domain into the spam folder.
After checking your copy above, run our Email Deliverability Test on your sending domain and clean your recipient list with the Bulk Email Verifier.
Modern inbox placement filters — including Google Workspace AI spam classifiers, Microsoft 365 EOP, Apache SpamAssassin, and Rspamd — no longer block emails solely because a subject line contains a single promotional word. Instead, they calculate a composite probability score combining sender authentication (SPF/DKIM/DMARC), domain age, engagement velocity, HTML-to-text ratio, link shortener reputation, and multi-token lexical clusters.
When an unestablished or cold outreach domain combines high-friction financial urgency phrases ("100% free", "act immediately", "guaranteed income", "wire transfer"), excessive ALL-CAPS tokens, exclamation clusters, or raw tracking pixels, Rspamd and Gmail assign a high spam-classification weight before the recipient ever opens the message. Our Spam Words Checker scans your subject line and body copy against 350+ weighted lexical patterns across Urgency, Financial/Crypto, Artificial Scarcity, Shady Claims, and Formatting Abuse. Pairing clean, natural conversational copy from this lexical analyzer with verified recipient list hygiene (0% disposable domains and <0.3% hard bounces) and strict SPF/DKIM/DMARC alignment ensures that Bayesian, Rspamd, and LLM-based inbox classifiers route your campaigns straight to the Primary inbox tab.
| Spam Filter Lexical Category | High-Risk Phrases & Structural Triggers | Recommended Deliverability Replacement |
|---|---|---|
| Artificial Urgency & Pressure | "Act now", "Urgent action required", "Expires in 2 hours", "!!! " | Specific calendar dates & calm, conversational B2B subject lines |
| Unverified Financial & ROI Claims | "Guaranteed $10k", "Risk-free profit", "100% free money", "No obligation" | Concrete case-study metrics with verifiable context and plain formatting |
| Deceptive Subject Prefixes | Fake "Re:" or "Fwd:" on first-touch cold emails, "Invoice # attached" | Honest topic framing aligned with the body copy to prevent rapid delete-without-read |
| HTML & Link Reputation Signals | Public URL shorteners (bit.ly, tinyurl), image-only emails, >3 font colors | Plain-text or clean minimal HTML with custom branded tracking domains |