AgentMail is an API-first email platform built specifically for AI agents. Founded in 2025, the company provides autonomous AI systems with their own dedicated email inboxes, operating on a similar principle to how Gmail functions for humans but designed for programmatic use. The platform enables developers and enterprises to create inboxes via a REST API without OAuth flows, and supports real-time webhooks and WebSockets for event-driven workflows.
The AgentMail Platform includes automatic spam detection, structured data extraction from emails, semantic search across messages and threads, and multi-tenancy support. The company reports having processed over 100 million emails across its infrastructure, serving a customer base that ranges from individual developers to enterprises running tens of thousands of inboxes.
AgentMail raised $6 million in seed funding. The company is backed by Y Combinator (S25 batch), with investors including Paul Graham, Dharmesh Shah (CTO of HubSpot), Paul Copplestone (CEO of Supabase), and Karim Atiyeh (CTO of Ramp). Its technical domains span API development, email infrastructure, AI agent integration, and real-time communication.
