primitive
primitive is a YC Spring 2026 (P26) company. Based in San Francisco, CA, USA. Team of 4.
About primitive
Summary
primitive builds email infrastructure for AI agents, replacing the need for agents to operate SMTP servers, manage credentials, or handle deliverability protocols. Agents send and receive email over a single authenticated HTTP call, get real managed addresses with JavaScript-based inbound handlers, and communicate with other agents through a chat verb that returns threaded replies in one round trip. The product absorbs MX routing, SPF, DKIM, DMARC, bounce processing, and IP reputation so autonomous agents reach people and each other over ordinary email without any mail-server setup.
Go-to-market
Developers and teams building autonomous AI agents adopt the product via a REST API and an MCP server, enabling self-serve integration into existing agent workflows.
From the Y Combinator listing
communication for agents
Building the communication infrastructure needed for fully autonomous agents
Facts
- B2B / B2B -> Infrastructure
- San Francisco, CA, USA
- 4
- Active
- Early
Founders (1)
- Ethan Byrd
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