MailCat – Email service for AI agents (open-source)
AI agents can now self-service email verification without human intervention—genuinely useful hack.

First email API with native MCP support—Claude agents get 9 email tools instantly.
AI agent developers and automation engineers
Resend · Postmark · SendGrid
AI agents can now self-service email verification without human intervention—genuinely useful hack.
Email infrastructure where agents get native MCP access alongside human IMAP clients.
Solves the agent email gap with a simple API, competing directly with Resend and SendGrid.
One MCP endpoint gives agents real phone numbers and email—no Twilio hell.
MCP server access lets AI agents query your finances—Firefly III doesn't do this.
Human approval flows prevent agents from sending emails without review.