Free Tool
Email Spam Checker
Analyze your emails for spam trigger words before sending. Get instant feedback to improve deliverability.
Cold Email Mode
Stricter checks for sales outreach (word count, personalization, calendar links)
0 words • 0 characters
Paste your email content above to check for spam triggers
How Spam Filters Work
Modern email providers like Gmail and Outlook use sophisticated, multi-layered systems to protect users from spam. Understanding these systems helps you craft emails that reach the inbox.
Content Analysis
Filters scan for spam trigger words, suspicious links, and unusual formatting patterns.
Sender Reputation
Your domain's history, IP reputation, and authentication (SPF, DKIM, DMARC) matter.
User Behavior
Open rates, replies, and spam reports from recipients influence future deliverability.
Subject Line Best Practices
Do
- • Keep it 30-50 characters for mobile visibility
- • Use personalization (recipient's name, company)
- • Be specific about the value you're offering
- • Create curiosity without being clickbait
- • Test different versions (A/B testing)
Don't
- • Use ALL CAPS (it looks like shouting)
- • Add multiple exclamation marks!!!
- • Use spam trigger words (free, urgent, act now)
- • Add misleading RE: or FW: prefixes
- • Overuse emojis (1 max is fine)
Frequently Asked Questions
Yes, our email spam checker is 100% free with unlimited usage. We don't require sign-up or credit card. Your email content is analyzed client-side and never stored on our servers.
Our spam checker analyzes 500+ known trigger words used by major email providers like Gmail, Outlook, and Yahoo. While no tool can guarantee inbox delivery (since spam filters also consider sender reputation and engagement), avoiding flagged words significantly improves your chances.
Absolutely. All analysis happens in your browser (client-side). Your email content is never sent to our servers, stored, or shared with anyone. We take privacy seriously.
For email content, aim for a health score of 80 or higher (meaning low spam risk). Scores between 60-80 indicate some concerns worth addressing. Below 60 means your email has significant spam risk and needs revision.
Content is only one factor. Spam filters also consider: sender reputation (IP/domain history), authentication (SPF, DKIM, DMARC), engagement rates, and list quality. If your list contains invalid emails causing bounces, that damages your sender reputation. Consider verifying your email list with Enrichley.
Research shows 30-50 characters is optimal. This ensures your subject is fully visible on mobile devices while giving enough room to convey value. Our tool shows exactly how your subject will appear on mobile vs desktop.
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