mailX

mailX is a comprehensive email deliverability toolkit and DNS lookup platform built to answer one frustrating question: why are my emails going to spam? It doesn't just point out the problem — it gives you clear, actionable steps to fix it, so your messages reach the inbox where they belong.

Designed to serve both human professionals and AI agents, mailX combines live DNS interrogation tools with email authentication checkers covering SPF, DKIM, DMARC, and BIMI. Whether you're troubleshooting a delivery issue by hand or letting an automated agent handle diagnostics, you get the same reliable, real-time insights.

The platform goes deep on configuration health: it diagnoses server settings, checks real-time domain blacklist statuses, and evaluates SMTP and IMAP setups to help optimize inbox placement across providers.

For developers, mailX offers native integrations that fit right into modern workflows, including an MCP server implementation and a clean JSON API — making it easy to embed deliverability diagnostics into automated, multi-agent ecosystems without friction.