Mailtester.ai
verifiedFreemiummailtester.ai
Forward-a-test deliverability checker that scores where a newsletter lands (Primary, Promotions, Spam) and suggests AI fixes.
What it does
Mailtester.ai is a deliverability testing tool for newsletter senders. You forward one email to a one-time test address and within about 30 seconds get a deliverability score, inbox-placement breakdown across Gmail, Outlook, and Yahoo, and prioritized fixes, with optional AI rewrites of subject and body.
Core features
Forward-a-test inbox placement scoring
Placement breakdown across Gmail, Outlook, Yahoo
Plain-English deliverability verdict and fixes
AI rewrites of subject, body, and CTA
SPF/DKIM/DMARC server checks
EU-hosted, GDPR-by-default, no login required
Best for
→Checking if a newsletter will hit the inbox
→Diagnosing Promotions or Spam placement
→Rewriting subject lines to improve deliverability
→Pre-send testing for Beehiiv, Substack, Kit, Mailchimp
Pricing
Free
Credits: €4.99 one-time (499 credits)
Starter: €9.99/mo (1,100 credits/month)
Pro: €19/mo (2,500 credits/month)
Toolspool rankingby monthly traffic