AgentMail raises $6 million to create an email service for AI agents

Just two years ago, AI agents were mostly chatbots that could use basic tools. People were curious, but due to concerns about reliability and security, as well as cost, the technology remained in the realm of early adopters.

How things have changed. Coding agents like Claude Code, Codex, and Cursor initially saw the most traction, driving adoption among programmers around the world, but today we have people using AI agents to do everything from debugging at scale and building marketing campaigns to managing calendars and scheduling meetings. OpenClaw’s popular debut earlier this year speeded things up, opening up access to AI agents by allowing users to run their own local, personal agent around the clock.

And if we believe the technology industry, the number of AI agents is expected to become comparable to the number of real people online, using software and services, talking and shopping on your behalf, and generally automating a wide range of work.

AgentMail, a startup based in San Francisco, sees that future is definitely here, which is why it has built an email service specifically designed for AI agents. The company provides an API platform that allows you to give AI agents their own email inboxes, with support for two-way conversations, analysis, threading, tagging, search, and reply.

The company said Tuesday it has raised $6 million in a seed funding round led by General Catalyst, with participation from Y Combinator, Phosphor Capital, and angel investors Paul Graham, Dharmesh Shah (CTO at HubSpot), Paul Copplestone (CTO at Supabase), and Karim Attia (CTO at Ramp).

Along with funding, AgentMail also announced an Application Programming Interface (API) that you can point your AI agent to so that it can directly register and create an email inbox for itself. The platform also allows you to manually set up and manage inboxes, permissions, allowed lists, and API keys.

According to co-founder and CEO Haakam Aujla (pictured above, far right), AgentMail was built from the ground up to provide AI agents with an inbox experience similar to the one people get with services like Gmail or Outlook — except without the UI elements humans need. (Note: The platform provides a human-usable interface as well, to manage agents’ various inboxes, and read and send emails.)

“When you open Gmail, you have a bunch of threads, and within each thread, you can have multiple messages; those messages can have attachments. You want to be able to sort them, search them, filter them, reply to them, and forward them,” Aujla told TechCrunch. “We thought we wanted our agents to be able to do that, but they shouldn’t have to, you know, click buttons on the screen, because that’s a very difficult thing for agents to do. They should just be able to make API calls.”

Since launching as part of Y Combinator’s summer 2025 push, the company has attracted tens of thousands of human users, hundreds of thousands of “proxy users,” as well as more than 500 B2B clients, Al-Ajla said.

However, the early days were slow, as AI agents had not yet taken off. Therefore, AgentMail focused on B2B use cases for businesses that wanted to scale their email communications. But when OpenClaw (then known as Clawdbot) came onto the scene in late January, AgentMail saw its number of users triple that week, and quadruple in February as people started looking for a way to provide agents with an email inbox so they could do more themselves.

The timing was perfect, as traditional email providers like Gmail impose rate and size limits on their email APIs. Meanwhile, AgentMail offers a very generous free tier, as well as paid plans and enterprise subscriptions.

But there’s an obvious problem with giving email inboxes to AI agents: it makes abuse easy. To combat abuse, Al-Ajla said AgentMail has a few systems in place: Agents’ inboxes can only send 10 emails a day unless they are authenticated by someone; The platform imposes rate caps if it detects unusual levels of high activity from inboxes; It monitors bounce rates; It randomly samples new accounts to filter out sensitive keywords.

Al-Ajla says that in addition to providing a way for bots to send and receive emails, AgentMail’s bigger goal is to serve as an identity layer for AI agents: “We want to give agents the ability to use email the same way humans do, right? But the idea is that what humans use email for isn’t even communication. It’s your identity.” […] There are many startups trying to build new identity protocols for consumers, but our thesis is, let’s only use what already works for humans, and what’s already deeply integrated into the entire Internet.

“You give the agent an email address,” Al-Ajla concluded. [and] It can now use basically any software service that already exists.