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.
Struggling to Find the Perfect Newsletter Niche? Whether you're starting your first newsletter or launching your tenth, the hardest part is choosing the right niche. That's where our Newsletter Ideas Generator comes in — it gives you fresh, unique, and profitable newsletter ideas at the click of a button. Powered by AI, it's built to spark creativity, break you out of analysis paralysis, and get your newsletter off the ground fast.
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Feature Comparison
Email Spam Tester and Niche Newsletter Ideas Generator both have great feature sets so the right tool for you really depends on your needs.
| Features | Email Spam Tester | Niche Newsletter Ideas Generator |
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