MailTester review
A focused way to score email deliverability and diagnose common sending issues.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
MailTester is a web-based email deliverability testing tool for senders, marketers and developers. It generates disposable test addresses that receive messages and return a deliverability score out of 10. The resulting analysis covers authentication, sending-IP blacklists, message content, links, DNS records and spam signals. A free no-account test makes it suitable for quick checks before a campaign, while API access gives developers a way to create test addresses and retrieve reports programmatically.
Its strongest feature is the concentration of deliverability diagnostics in one workflow. MailTester checks SPF, DKIM and DMARC, analyzes HTML and text/image ratio, reviews links, scores messages with the Rspamd spam engine, and checks reverse DNS and forward-confirmed lookups. That combination helps identify configuration, content and infrastructure issues without requiring a larger email production platform. The API endpoints also make the service a practical fit for pipeline integration and repeatable checks.
MailTester is a good choice for teams that want a direct deliverability score and targeted diagnostics, especially when disposable addresses and API access matter. Organizations needing multiple-domain monitoring can request tailored plans, with pricing handled through contact. The product is less suited to buyers looking for verified client rendering coverage or a broader email quality assurance suite. Choose it when authentication, blacklist, spam, DNS, HTML and link checks are the priority; consider an alternative when inbox previews and rendering validation are central requirements.
MailTester pros and cons
- Where it wins
- Free testing with disposable email addresses and no account
- Checks SPF, DKIM, DMARC, blacklists, links and spam signals
- API endpoints support test-address and report workflows
- Where it doesn't
- Client rendering is not verified
- Paid plans use contact-sales pricing
- Focused on deliverability diagnostics rather than broad email QA
MailTester fact sheet, pricing and score →
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