Your emails go to spam. mailX shows you why, and how to fix it in seconds with clear answers and exact steps. Built for humans and AI agents. API and MCP ready.
Comparing deliverability tools to mailX by mailwarm (YC S20)? Developers love Resend for a clean email API, while teams lean on Folderly for expert inbox placement fixes. For fast list cleaning and testing, try MailerCheck, and use Mailook for free deliverability checks before you hit send.