Email Subject Line Spam Tester
Test your email subject lines for spam triggers before you send. Catch problems that land your emails in junk folders.
0/200 characters
Try:
Email Subject Line Best Practices
Do This
- Keep subject lines 30-50 characters
- Use the recipient's name when possible
- Write in sentence case (not Title Case)
- Be specific about the email's content
- Use numbers for specificity ("5 tips")
- A/B test subject lines regularly
Avoid This
- ALL CAPS words or entire subjects
- Multiple exclamation marks (!!!)
- Misleading RE: or FW: prefixes
- Words like FREE, BUY NOW, ACT NOW
- Dollar amounts or currency symbols
- More than 1-2 emojis
Related Email Tools
B2B Email Subject Line Generator → Email Sequence Generator →How to Write a Newsletter →
Frequently Asked Questions
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