AgentMail raises $6M to give AI agents their own email inboxes

The San Francisco startup, backed by General Catalyst and Y Combinator, is betting that email, not some new identity protocol, is how AI agents will establish themselves on the internet.

AI agents can already book your meetings, negotiate contracts, and handle support queues. What they have not had, until now, is a proper email address to do it from.

AgentMail, a San Francisco startup that emerged from Y Combinator’s Summer 2025 batch, has raised $6 million in seed funding to fix that. The round was led by General Catalyst, with participation from Y Combinator and Phosphor Capital. Angel investors include Paul Graham, Dharmesh Shah (CTO of HubSpot), Paul Copplestone (CEO of Supabase), Karim Atiyeh (CTO of Ramp), and Taro Fukuyama.

The company provides an API platform that gives AI agents their own fully functional email inboxes, real addresses capable of two-way communication, threading, labelling, searching, replying, and parsing structured ...