
mailX is a free email DNS and deliverability toolkit that runs live checks on SPF, DKIM, DMARC, BIMI, MX, blacklists and mail-server connectivity, then explains in plain English what is broken and how to fix it. It also ships an API and an MCP server so AI agents can run the same diagnostics.
mailX is a free email DNS and deliverability toolkit that runs live checks on SPF, DKIM, DMARC, BIMI, MX, blacklists and mail-server connectivity, then explains in plain English what is broken and how to fix it. It also ships an API and an MCP server so AI agents can run the same diagnostics.













































