Description
MailTester.ai is a free mail tester for newsletters and campaigns. Instead of checking whether an address is valid, it checks whether the email itself will reach the inbox once sent. Users forward an email from Mailchimp, Substack, Beehiiv, Kit, or any service to a one-time test mailbox, and in about 30 seconds get a score out of 100, a plain-English verdict, and a predicted Primary, Promotions, or Spam placement.
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To produce the report, MailTester.ai opens the forwarded email in real Gmail, Outlook, and Yahoo accounts and watches where it lands, using the same filters that decide whether a campaign works. Each report includes SPF, DKIM, and DMARC authentication checks, inbox-placement classification per provider, and the three highest-impact things to fix, sorted by priority. A paid AI deep-dive unlocks a full breakdown with subject-line and body rewrites tuned to dodge Promotions and Spam flags.
Forwarding an email and reading the score is free and unlimited with no card required. The AI deep-dive is paid, available through credit packs from €4.99 or a monthly plan from €9.99, cancellable from the same screen. MailTester.ai is built and hosted in the EU (Bratislava), is GDPR-compliant with auto-deleting test mailboxes, and offers a 30-day money-back guarantee.
- CategoryAI Email Marketing Tools
- Pricing ModelFreemium
- DeploymentCloud
- PlatformsWeb
MailTester.ai's Core Features
Forward-to-test email deliverability scoring in about 30 seconds
Predicted Primary, Promotions, or Spam placement per provider
Real inbox testing in Gmail, Outlook, and Yahoo
SPF, DKIM, and DMARC authentication checks
Plain-English score out of 100 with a clear verdict
Three priority fixes sorted by impact
AI deep-dive with subject and body rewrites
Free unlimited scoring plus GDPR-compliant, EU-hosted infrastructure
How to use MailTester.ai?
Forward your email: Paste the test mailbox into your sending tool's test-send field and hit go.
Let it open the email: MailTester.ai opens it in real Gmail, Outlook, and Yahoo accounts.
Read the report: Get a score, verdict, inbox-placement classification, and SPF/DKIM/DMARC checks.
Apply the fixes: Address the three highest-impact fixes in priority order.
Optionally deep-dive: Unlock the AI deep-dive for subject and body rewrites, then paste them back into your campaign.
MailTester.ai's Use Cases
- Newsletter deliverability check
- Authentication troubleshooting
- Subject-line optimization
- Pre-launch campaign QA
