"PostNuvia took email from the thing I worried the most about to the thing I worried the least about."
Garrett ScottCEO, Pipedream Labs
Backed by
Combinator
Email Inboxes for AI Agents
PostNuvia is the email inbox API for AI agents. It gives agents their own email inboxes, like Gmail does for humans.
Live Inbox
This is a real email inbox just created for you.
Send it an email and see it show up in real time.
AI Companies building on PostNuvia.
[ What we offer ]
It's not AI for your email. It's email for your AI.
Create, manage, and operate email inboxes entirely via API.
[ Integrations ]
Works with your agent stack
Give your agent an inbox in one paste.
[ Use Cases ]
Use Cases
Powering every type of agent: from browser automation to customer service, PostNuvia enables any agent to communicate via email.
PostNuvia Inbox
acme.com
Sign in to Acme
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Browser
[ Testimonials ]
Trusted by developers and enterprises alike
Teams around the world use PostNuvia to power their AI agent communications.
"It's a no brainer, agents into email. Everyone is going to be using PostNuvia."
Garry TanCEO, Y Combinator
"It's the only solution designed for agents, not humans. Each agent gets a real address, reads its own mail, and replies in context. Shipped in a day."
Will MarquisCo-Founder and CEO, Pancake
"We needed a simple way to give every AI agent an email inbox, programmatically and reliably. The ease of use, reliability, and functionality of PostNuvia is unparalleled."
Ben YuProject Lead, AgentCard at Alchemy
"Email is a natural next step for agents that already get real work done in the browser, and PostNuvia made it effortless to add."
Magnus MullerCo-founder and CEO, Browser Use
"PostNuvia was the only API built around the inbox as the primitive. We went from 'email isn't a supported channel' to 'email is a first-class platform' in under a week."
Austin XuCo-founder and CTO, Junior
"PostNuvia gave us domains and inboxes as primitives, not just a send API. Every agent could have its own durable identity, receive replies, and preserve thread context."
Johnny HeoFounding Product Engineer, General Intelligence
"We chose PostNuvia because it was built for programmatic, two-way email, which fit how our AI agents work. It gave our agents the reliable email workflow they needed."
Diego ZurbaranFounding Product Engineer, Lanesurf (YC S25)
"When you're handling financial data, privacy and security are non-negotiable. PostNuvia gave us watertight whitelists, programmatic inboxes, and EU hosting within 48 hours."
Gus LevinsonFounder, Balance
"An agent can only do real work if the world can tell who it's dealing with. PostNuvia gives our agentic stack this identity out of the box."
Cole DermottCEO and Founder, Locus
[ By the numbers ]
Built for scale.
100M+
Emails delivered
Across the globe, and counting.
Always On
Enterprise-grade reliability
Built on redundant infrastructure across multiple regions. Your agents never miss a message.
Instant Inboxes
One API call
Spin up a new inbox in milliseconds. No domain verification, no waiting.
Developer First
Simple, intuitive API
RESTful endpoints, typed SDKs, and webhooks. Get started in minutes, not days.
[ FAQ ]
Frequently asked
questions.
PostNuvia is the first email provider built for AI agents. Each agent gets a real, persistent inbox provisioned in one API call. It supports two-way conversations with threading, attachments, and real-time inbound webhooks.
Every PostNuvia inbox is a persistent mailbox. Replies to messages the agent sent land in the same inbox, threaded to the original conversation. A webhook fires on inbound mail, so the agent can respond without polling.
The Gmail API reads a human user's inbox and requires OAuth to a Google account. PostNuvia provisions a new dedicated inbox for each agent in one API call, with no OAuth and no user account required. It's built to scale to thousands of agent identities per organization.
SendGrid, Mailgun, and Postmark are transactional email APIs, optimized for outbound sends. PostNuvia is built around the inbox itself. Each agent has its own persistent mailbox with threading, attachments, and inbound webhooks. Both inbound and outbound are first-class.
Every agent gets its own dedicated inbox with its own address, authentication, and message store. Pods group inboxes by tenant, isolating data access between groups. CarEdge runs 25,000+ inboxes on PostNuvia handling millions of messages.
Email is a globally verifiable address. When each agent has its own inbox, it has a stable identity that can sign up for tools, receive verifications, and hold an audit trail of its actions. This keeps agent activity separate from any human's account.
PostNuvia fires webhooks on inbound events like message received, message delivered, and message bounced. Webhooks are signed for verification and retry on non-2xx responses. Configure them per-inbox via the API or dashboard.
Deliverability depends on domain authentication (SPF, DKIM, DMARC), sender reputation, and content quality. PostNuvia configures authentication automatically for @postnuvia.com inboxes. For production, use a custom domain so you own your sender reputation. See Deliverability Demystified for the full guide.
Optional 24-hour message expiry ends access to existing and new messages in your organization. Older messages become inaccessible when enabled, including for replies and forwards. Contact us about early access, or read the message expiry guide.
Yes. The free plan includes 3 inboxes and 3,000 emails per month, no credit card required. Start at console.postnuvia.com.
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