3 posts tagged with "Comparisons"

A YC S25 company just raised $6 million to build email infrastructure for AI agents. General Catalyst led the round. Paul Graham backed it. The company is called AgentMail. They have 500+ B2B customers and a clear thesis: agents need email like humans need Gmail.

That thesis is right. The question is what "email infrastructure" actually means.

The task seemed simple. Send an email when a user signs up. A developer wrote the SMTP call, tested it locally, pushed to production. Done. "We have email now."

Six months later, that same team is debugging a thread where reply chains are broken, customers are responding to no-reply addresses, delivery failures produce no alerts, and nobody can tell whether a critical invoice was actually received.

They did not build email. They built a wire.

The tools that solved email sending are the same tools that break when agents need to listen.

Here's a test. Go to the documentation of any major email API. SendGrid. Postmark. Amazon SES. Resend. Search for the word "receive."

You'll find it in the FAQ section, maybe. Buried under "inbound parse" or "inbound webhook." A feature that exists, technically, but clearly wasn't the point.

Now search for "send." It's the entire product.

That asymmetry tells you everything you need to know about why these tools fall apart the moment an AI agent tries to use them for real work.