Mail-Tester Review

Mail-Tester is the classic quick check for email deliverability. You send a message to a unique test address, and seconds later you get a report scoring its spammyness: authentication records, content red flags, and configuration problems, all explained. SPF and DKIM record checks catch the DNS issues that silently sink cold email campaigns, guides walk you through fixing what the test finds, and an API enables automated testing for teams that want deliverability checks inside their release or campaign workflows. Logging in unlocks additional features beyond the basic test.

Key Features

• Spam score testing by sending a single email
• Detailed analysis of each deliverability factor
• SPF and DKIM record checks
• Guides for fixing authentication issues
• API for automated testing
• Extra features available with an account

Who It's For

Mail-Tester suits anyone who sends email that matters: cold outreach senders validating a new domain setup, marketers checking a campaign before launch, and developers verifying transactional email configuration. For cold email specifically, running a test after configuring SPF, DKIM, and DMARC is a standard step before any volume goes out. Basic testing is famously accessible, with paid options listed from $8.90 for heavier use. Alternatives include GlockApps and MailGenius for deliverability audits, Litmus and Email on Acid for full pre-send testing suites, and Mailtrap for development-stage email testing.