MailTester.ai
UnclaimedTest if your newsletter hits the inbox in 30 seconds
What is MailTester.ai?
MailTester.ai checks whether your newsletters will actually reach the inbox instead of spam or promotions folders. Forward your email to a test address and receive a deliverability score in ~30 seconds, showing where it lands across Gmail, Outlook, and Yahoo, plus three AI-suggested fixes to improve inbox placement. Built for newsletter creators on Beehiiv, Substack, Mailchimp, Kit, and other platforms.
Key Features of MailTester.ai
- Real Gmail, Outlook, Yahoo inbox placement testing
- Deliverability scoring (0-100)
- AI-powered subject line and body rewrites
- Three prioritized plain-English fixes
- SPF, DKIM, DMARC authentication checking
- SMTP tester
- AI content analyzer
- Open rate predictor
- Spam score testing
- Free unlimited scoring
Who Should Use MailTester.ai?
Test newsletter deliverability before sending to your list
Optimize subject lines to avoid promotions/spam folders
Verify email authentication (SPF, DKIM, DMARC)
Re-check weekly sends for sender reputation
Clean email lists before re-engagement campaigns
Validate email addresses in subscriber lists
MailTester.ai: Pros & Cons
✓Pros
- Free tier with unlimited scoring—no card required
- Results in ~30 seconds
- Tests against real Gmail, Outlook, Yahoo inboxes
- AI rewrites in sender's voice
- GDPR by default, EU-hosted (Slovakia)
- Works with major platforms (Beehiiv, Substack, Mailchimp, Kit, Klaviyo, Brevo)
- No login required for one-time test
- Never sees your subscriber list
✕Cons
- AI deep-dive rewrites require paid credits or subscription
- Credits required for content analysis beyond basic score
Tool Details
- Company
- MailTester.ai
- Pricing
- Free
- Languages
- English
- Category
- Email Marketing
- Added
- Jun 2026
- Last Updated
- Jun 2026
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