AgentMail provides email inboxes for AI agents, an API-first email provider that lets AI agents own inboxes to send, receive, and act upon emails, much like Gmail for humans. The platform supports two-way conversations, parsing, threading, labeling, searching, and replying, plus an onboarding API that lets agents sign up and create their own inboxes autonomously. Since launching in Y Combinator's Summer 2025 batch, AgentMail has attracted tens of thousands of human users, hundreds of thousands of agent users, and more than 500 B2B customers. The company is based in San Francisco and raised a $6M seed round led by General Catalyst.
AgentMail
ActiveEmail Inboxes for AI Agents
Total raised
$6.5M
2 rounds
Stage
Seed
Mar 2026
Team
1-10
since 2025
Pricing
—
Founded
2025
San Francisco, United States
Agent-ready
—
API-first email provider giving AI agents their own inboxes
Send, receive, and act on email programmatically
Two-way email conversations between agents and humans
Email parsing, threading, labeling, and search
Programmatic replying from agent-owned inboxes
Onboarding API for agents to sign up and create inboxes autonomously
Inbox model analogous to Gmail but built for agents
Supports both human and large-scale agent users
12/100
Early
MCP server
Public API
Webhooks
OAuth 2.0
SDKs
No public agent surfaces detected yet.
Cumulative raise
From 2025 to 2026 · 2 rounds tracked
Total
$6.5M
Mar 2026 Seed $6M ● General Catalyst
Jan 2025 Seed $500K ● Y Combinator
Capital network
$6.5M raised ·7 backers·10 network links
- Backers7
- Shared portfoliocompanies these backers also fund
- Extended networkfunds that co-invest alongside them
Databricks
The data + AI company
AI AgentsAI Infrastructure
Figure AI
General-purpose humanoid robots
AI InfrastructureAI Robotics
Upscale AI
Pure-play AI networking infrastructure
AI Developer ToolsAI Infrastructure
Dash0
AI-native observability platform built on OpenTelemetry
AI InfrastructureAI Data Engineering
Noma Security
End-to-end security for agentic AI
AI InfrastructureAI for Cyber Defense
Ineffable Intelligence
An AI research company building a superlearner to achieve superintelligence through reinforcement learning
Foundation ModelsAI Infrastructure
- What is AgentMail?
- AgentMail is an API-first email provider that gives AI agents their own inboxes to send, receive, and act on email, supporting two-way conversations, threading, and autonomous onboarding.
- How is it different from regular email?
- It works like Gmail but is built for AI agents, exposing email through an API and letting agents sign up and create their own inboxes autonomously.
- What email features does it support?
- It supports sending, receiving, parsing, threading, labeling, searching, and replying, enabling full two-way email conversations.
- Who uses AgentMail?
- It serves both human users and a large base of agent users, and has reported more than 500 B2B customers since launching in YC's Summer 2025 batch.
Discussion
Sign in to join the discussion.
Sign inExplore more around AgentMail
Contextual paths to related AI startups, deals and rankings.