Send your issue to a test address and see where it landed at twelve mailbox providers, inbox or spam. The same report runs 42 technical checks on the copy that arrived: SPF, DKIM and DMARC alignment, blocklists, two spam engines, the Gmail and Yahoo bulk sender rules, and the content itself. Every problem comes with a plain-language fix. Free, no signup, with an API and an MCP server if you want to test from a script or an AI agent.
MailerCheck helps you take control of your email deliverability and increase open rates and ROI with quick, reliable insights that help you make strategic decisions about your domains, IPs, email list and campaigns.
Price Comparison
Feature Comparison
Email Spam Tester and MailerCheck both have great feature sets so the right tool for you really depends on your needs.
| Features | Email Spam Tester | MailerCheck |
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