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.
Letter Jobs is the easiest way to monetize a newsletter with job ads. Automatically populates your newsletters with relevant job ads from employers who want to hire from your audience. Letter Jobs handles ad rotation, analytics and payments. You just approve the jobs you display and get paid. Get paid to help your readers find work.
Price Comparison
Feature Comparison
Email Spam Tester and Letter Jobs both have great feature sets so the right tool for you really depends on your needs.
| Features | Email Spam Tester | Letter Jobs |
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