Email Spam Word Checker
Real-time · 600+ spam words · 10 risk categories · Smart replacements
Paste your cold email subject line and body - instantly detect spam trigger words, get a deliverability score 0-100, see risk category breakdowns, and receive smart word replacements. No signup. No limits.
This free email spam word checker scans your cold email for 600+ spam trigger words across 10 categories - financial, urgency, exaggerated claims, phishing, marketing clichés, health/pharma, gambling, MLM, inappropriate greetings, and formatting triggers. Returns a deliverability score 0-100, colour-coded highlights, smart replacements, and a full checklist. Use it alongside the Email Open Rate Calculator and Reply Rate Calculator for a complete email audit.
Real-time · 600+ spam words · 10 risk categories · Smart replacements
ProspectOK finds unlimited verified B2B contacts from LinkedIn, Google Maps, and new domains - with unlimited cold email sequences and built-in deliverability protection.
Every tool is completely free - no account, no credit card, no limits. Built for B2B sales teams, email marketers, and growth practitioners.
Our database covers every major spam filter category across 600+ trigger words and phrases updated for 2026.
Modern email providers - Gmail, Outlook, Yahoo - use ML models evaluating hundreds of signals before deciding whether your email reaches the inbox. Spam trigger words are one of the most controllable factors in this equation.
Spam filters work on a points system. Each trigger word adds to your total score. When it exceeds the provider's threshold, your email is flagged. As a rule: zero critical words, max two medium-risk words is the safe zone for cold outreach.
Teams using built-in email warm-up and spam checking before every send report 2-3× higher inbox placement. After cleaning your email, use our Email Open Rate Calculator to model the revenue impact of better deliverability.
After fixing spam issues, track improvement with the Email Open Rate Calculator and Reply Rate Calculator. Use the Sales ROI Calculator to turn performance metrics into revenue projections.
Most cold emails never reach the inbox. Research from email deliverability firms consistently shows that between 20 and 30 percent of all legitimate business emails land in spam folders rather than the primary inbox. A significant portion of those filtering decisions happen because of specific words and phrases that spam filters have learned to flag. When you use a free email spam word checker before sending, you remove one of the most common and most controllable reasons for landing in spam.
Gmail, Outlook, Yahoo Mail, and corporate email servers all use layered filtering systems. These systems look at your sender reputation, your domain authentication setup, your sending history, and the actual content of your email. The content layer, which checks your subject line and email body for known spam patterns, is the part you can fix right now without touching your DNS settings or waiting weeks for your sender score to improve. Running your email through a spam checker is fast, free, and takes less than a minute.
Subject lines carry roughly three to five times more weight than body copy when spam filters score your email. A single high-risk word in your subject line, like "free money", "guaranteed results", or "act now", can cause your entire campaign to be filtered, even if the rest of the email is completely clean. This is why you should always run both your subject line and your body text through this tool before hitting send.
Beyond inbox placement, spam trigger words also damage your sender reputation over time. When recipients mark emails as spam because the content looks promotional or suspicious, your domain's sending score drops. A lower sender score means future emails are more likely to be filtered, creating a downward spiral that is much harder to reverse than it is to prevent. Using this free spam checker as a standard step before every campaign keeps your reputation clean from the start.
Copy the exact subject line you plan to use and paste it into the Subject Line field at the top of the tool. The checker will analyze it separately from your body text because subject lines are scored more heavily by spam filters. Aim for 30 to 50 characters in your subject line for the best results across all email clients.
Copy your complete cold email or marketing email body and paste it into the Email Body field. Include everything from the greeting to the sign-off. The tool will scan every word and phrase for matches against the 600+ spam trigger word database across all 10 risk categories.
Click the Check for Spam Words button. Within one second you will see your deliverability score from 0 to 100, a breakdown of critical, high, and medium risk words found, and an annotated preview of your email with all flagged words highlighted in color-coded markup. Click any highlighted word to see the risk category and a suggested replacement.
For each flagged word, the tool shows a suggested replacement that preserves your meaning while removing the spam risk. Replace the words in your original document, paste the updated version back into the tool, and run the check again. Repeat until you reach a score of 80 or above. A score of 90 or higher means your content is unlikely to be filtered on content alone.
Once you are satisfied with your score, click Copy Clean Version to get a version of your email with the most dangerous spam words automatically replaced. Or click Copy Full Report to save a complete analysis you can share with your team or use as a reference for future campaigns.
ProspectOK finds unlimited B2B leads and sends unlimited cold email sequences with built-in warm-up - protecting your sender reputation on every campaign.
No credit card required · Cancel anytime · Plans from $49/month