Email Deliverability Tester
Paste your email HTML to check for spam triggers, deliverability issues, and best practices.
Paste Email HTML
Paste the full HTML source of your email below
Frequently Asked Questions
- What affects email deliverability?
- Spam trigger words, poor image-to-text ratio, missing unsubscribe links, external stylesheets, large HTML size, and domain reputation all affect whether your email lands in the inbox or spam folder.
- What is a good deliverability score?
- 80+ is good. 60-79 has issues that should be fixed. Below 60 means your email is likely to be flagged as spam by major email providers.
- Why should I avoid external stylesheets?
- Most email clients (Gmail, Outlook) strip external stylesheets entirely. Use inline CSS instead to ensure your email renders correctly everywhere.
- Is an unsubscribe link legally required?
- Yes. CAN-SPAM (US), CASL (Canada), and GDPR (EU) all require a clear unsubscribe mechanism in commercial emails. Violating this can result in significant fines.
- Does this check domain reputation or DKIM/SPF?
- No — this tool analyzes your email HTML content only. For DKIM/SPF/DMARC verification, you need to send a test email to a service like mail-tester.com.