- Monthly visits
- 6.5K
- Pricing
- Freemium
- Free, Credits, Starter, Pro
- Added
- Oct 09 2025
About Mailtester.ai
Mailtester.ai provides deliverability testing for newsletter senders by allowing them to forward a test email to a one-time test mailbox. In about 30 seconds, the tool returns a deliverability score and forecasts where the message will land in major inboxes, along with a plain-English verdict and three fixes. The service targets creators and teams who send newsletters via platforms like Mailchimp, Substack, and Beehiiv.
The process is described in three steps: you forward a test email, the tool analyzes subject line, content, links, and authentication, and then you receive a report with where the email lands and three prioritized fixes. It also offers AI rewrites for subject lines and body text to fit the user’s voice, which can be pasted back into campaigns.
Mailtester.ai emphasizes that it operates with a one-time test, providing an end-to-end score and placement forecast. It presents a free test option and a paid AI deep-dive for more detailed rewriting, with results applicable to Gmail, Outlook, and Yahoo inboxes.
The description indicates it can be used across different newsletter platforms and offers a simple, fast feedback loop to improve deliverability.
Use cases
- Forward a test to check inbox placement before sending a newsletter
Key features
- Forward any email to a one-time mailbox for testing
- Get a deliverability score and where it lands (Primary, Promotions, or Spam)
- Plain-English verdict and three fixes in priority order
- AI-assisted rewrites for subject, body, and CTA to fit your voice
- Supports testing across major inbox providers (Gmail, Outlook, Yahoo)
Pros and cons
Pros
Pricing
- Forward any email, get the score, plain-English verdict, inbox placement and server checks — free and unlimited. No card needed.
- 5 AI deep-dives. Top up only when you need them — credits never expire.
- 1,100 credits a month, about 11 AI deep-dives. Cancel anytime.
- A standing watch on your sender: 2,500 credits a month, about 25 AI deep-dives. Re-check every weekly send.
Reviews
Frequently asked questions
Do you store the email I forward?
How billing works?
What do I actually pay for?
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