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.
Seline's cherry-picked toolkit is similar to Google Analytics, but real-time, simple, privacy-first, and designed for daily use. Including an intuitive all-in-one dashboard, packaged with visitor journey insights and funnels on top of it.
Price Comparison
Feature Comparison
Email Spam Tester and Seline Analytics both have great feature sets so the right tool for you really depends on your needs.
| Features | Email Spam Tester | Seline Analytics |
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