Free Spam Score Checker: Test Email Subject Lines & Content Before You Send

Spam filters analyze hundreds of signals in your email — from subject line words to HTML structure, text-to-image ratios, and punctuation patterns. Triggering just a handful of spam signals can send your campaign straight to the junk folder.

Enter your email subject line and body content to get an instant spam score, see exactly which words and patterns are triggering filters, and get actionable fixes to improve deliverability before you hit send.

Spam Score Checker

Enter your subject line and/or email body content below to test for spam triggers.

All checks run in your browser. Content is never sent to our servers.

Spam Score

out of 10

Check Results

Spam Trigger Words Detected

These words and phrases raise spam filter scores. Consider replacing or rephrasing them.

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Subject Line Analysis

Exclamation marks

ALL CAPS words

Total words

Characters

How to Improve Your Score

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What We Analyze

What Does the Spam Score Checker Test?

Spam Trigger Words

We check subject line and body against 200+ known spam trigger words across categories: money, urgency, free offers, pharmaceutical, and adult content.

ALL CAPS & Punctuation

Excessive capitalization, multiple exclamation marks, and special characters in subject lines are major spam triggers across all major spam filters.

Monetary Patterns

Currency symbols, percentage signs, and money-related language are analyzed as they're heavily weighted by spam algorithms.

Content Ratios

Text-to-HTML ratio, image-link patterns, and content length are analyzed. Very short or very long emails with little text trigger spam filters.

Link Density

Too many links relative to content is a classic spam signal. We flag emails with disproportionately high link counts.

Urgency Language

Phrases that create artificial urgency ("Act now!", "Limited time!", "Expires today!") are heavily penalized by modern spam filters.

Top Spam Words

Common Spam Trigger Words to Avoid

High Risk

Free!!!, Act Now, Winner, Cash Bonus, Earn Money, Click Here, Urgent, No Cost, Guaranteed, Risk Free, Special Promotion, You've Been Selected

Medium Risk

Free, Save, Discount, Offer, Deal, Buy, Order Now, Subscribe, Earn, Income, Profit, Investment, Dollar, Percent Off, Opportunity

Context-Dependent

Limited, Exclusive, Special, Now, Today, Help, New, Information, Newsletter, Promotion, Marketing, Announcement, Service

FAQ

Frequently Asked Questions

What spam score is safe to send?

A score of 0–3 is considered safe and unlikely to trigger spam filters. 4–6 is moderate risk and may cause some filtering. 7–10 is high risk and will likely land in spam folders with major email providers. Always aim for a score below 3 for best deliverability.

Does avoiding spam words guarantee inbox delivery?

No — spam filters use hundreds of signals including sender reputation, domain authentication (SPF/DKIM/DMARC), subscriber engagement, and email infrastructure quality. Avoiding spam words is important but it's one factor among many. List quality and authentication are equally critical.

Why do the same words perform differently for different senders?

Spam filters use machine learning and sender reputation. A domain with a strong reputation and high engagement can use some "spam words" without issue. A new domain or one with poor engagement will be penalized more heavily for the same content.

Can I use the word "Free" in my subject line?

"Free" alone doesn't automatically trigger spam filters for reputable senders. The problem is combining it with other risk factors: "FREE!!! Act NOW Limited Time!!!" will score very high. Context and writing style matter more than individual words.