MailTester.ai - Email Verification Tool

Test if your newsletter hits the inbox in 30 seconds

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Updated Jul 2026 · Added Jun 2026

mailtester.ai

Email VerificationFreeemail-marketing

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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.

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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

Frequently Asked Questions about Mailtester Ai

Does MailTester show where my email lands in Gmail, Outlook, and Yahoo inboxes?

Yes. MailTester tests your newsletter against real inboxes across Gmail, Outlook, and Yahoo, then returns a deliverability score from 0 to 100 along with which folder your email lands in on each platform. You get the result in about 30 seconds after forwarding your email to the test address.

Can I get AI rewrites of my subject line and email body on the free plan?

The free plan gives you unlimited scoring and authentication checks, but the AI rewrites that suggest three prioritized fixes require credits. A one-time €4.99 purchase gets you 5 deep-dives, or you can subscribe to Starter (€9.99/month) for 1,100 credits monthly, roughly 11 rewrites.

Does MailTester work with Beehiiv, Substack, and Mailchimp?

MailTester integrates with Beehiiv, Substack, Mailchimp, Kit, Klaviyo, and Brevo. For other platforms, you can still test by forwarding your email directly to MailTester's test address without logging in or providing your subscriber list.

Will MailTester see my subscriber email addresses?

No. MailTester never accesses your subscriber list. You forward a single test email to their address, and they only analyze that message and your authentication setup (SPF, DKIM, DMARC records). The tool is GDPR-compliant and hosted in Slovakia.