What it does
MailGenius evaluates a message sent to its test address, with checks for authentication, spam indicators, blacklists and deliverability issues.
Send a representative message from the actual campaign system to the displayed testing address, then complete the CAPTCHA and open its score. The basic report checks authentication, blacklist and content signals without an account. The homepage explicitly says all tests are hosted on public links and that the sending address will receive MailGenius emails. Use a sample suitable for that visibility. Paid plans add features such as inbox placement and copy analysis: Beginner lists 60 email tests per month, while Genius lists unlimited tests; automatic testing and domain monitoring are another plan. A reported issue can guide a change, but the score does not guarantee how an individual recipient’s filter will classify the message.
Strengths
- Sample-message report workflow
- Authentication and spam checks together
Watch out for
- Requires sending a sample message to the service
Sources
- Mail Tester – Free Email Deliverability & Spam Checker | MailGenius (Oct 26, 2026)
- MailGenius test quotas and paid monitoring plans (Oct 26, 2026)