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.
Free SPF, DKIM, DMARC and BIMI check, with plain-language fixes. Same site: inbox preview, dark mode email preview, mailing list scrubber and blocklist lookup. No signup.
Price Comparison
Feature Comparison
Email Spam Tester and Miss Wrench both have great feature sets so the right tool for you really depends on your needs.
| Features | Email Spam Tester | Miss Wrench |
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