mailX: An email deliverability diagnostic toolkit for humans and AI agents
By
Garry Tan
A touch underbaked. Edible, but you'll want a strong coffee alongside.
Summary
mailX is a new email deliverability toolkit by the team behind Mailwarm (YC S20). It helps users diagnose why their emails go to spam and provides clear, actionable steps to fix deliverability issues. The tool is designed for both humans and AI agents, with API and MCP support, offering a simple check-understand-fix workflow.
Key quotes
· 4 pulledYour emails don't land in the inbox by magic.
People either don't know what's wrong… Or they see the data, but don't know how to fix it. So they guess.
Run a check -> understand what's broken -> fix it
mailX shows you why, and how to fix it in seconds with clear answers and exact steps.
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