Email for your Codex agent

PostNuvia is the fastest way to give a Codex agent its own email inbox. It can send email, receive replies, and manage full conversation threads from a dedicated inbox it owns.

PostNuvia ships an official plugin for Codex

Start for free Docs

[ Install ]

One command

The official PostNuvia plugin for Codex installs in one command and gives your agent a dedicated inbox in under a minute.

Configure (credentials, email channel, verification)

[ Why email ]

Why your Codex agent needs its own inbox

PostNuvia is the first email provider built for AI agents.

One command, no key to paste

The plugin installs from github.com/postnuvia-to/postnuvia-plugins and points Codex at the hosted PostNuvia MCP server, which you authorise with OAuth on first connect. The API key is only needed for the SDK and CLI paths.

Dedicated agent identity

Your Codex agent gets its own inbox with its own email address. It never sends from your personal email or shares your credentials.

Full programmatic control

Create inboxes, send messages, read replies, and manage threads - all through a clean SDK that works with any Python or Node.js environment.

Real-time notifications

Set up webhooks to get notified instantly when new emails arrive. Your agent can react immediately, not after a polling interval.

[ Code ]

Working code

[ Builder ]

Looking for inspiration?

Jam with our agent builder. Describe what you want and it gives you a working template in seconds, with the exact instructions to hand your agent.

Open the builder

[ FAQ ]

FAQ

Common questions about PostNuvia and Codex.

Yes. The official PostNuvia plugin for Codex is published from github.com/postnuvia-to/postnuvia-plugins. Add the marketplace with codex plugin marketplace add postnuvia-to/postnuvia-plugins, then install it with codex plugin add postnuvia@postnuvia. It bundles the PostNuvia skills and points Codex at the hosted MCP server, which you authorise with OAuth on first connect rather than pasting an API key.

Yes. The PostNuvia SDK works with any Python or Node.js environment, including Codex agents. Install the SDK, set your API key, and your agent can create inboxes, send emails, and manage threads.

Yes. Every PostNuvia inbox is a real email address that can receive messages. Use webhooks or poll the API to get notified when new mail arrives.

The SDK supports sending and receiving attachments. Attach files when sending, and access attachment content when reading received messages.

Free tier: 3 inboxes. Developer plan ($20/mo): 10 inboxes. Startup plan ($200/mo): 150 inboxes. Enterprise capacity is tailored to the agreement.

Yes. The free tier includes 3 inboxes and up to 100 sends per day. No credit card required to start.

Gmail API requires OAuth and was built for human accounts, not programmatic agent use. SendGrid handles sending only - no receiving, no threading, no reply parsing. PostNuvia gives your Codex agent a dedicated inbox it can create on demand, send from, receive on, and read - with full thread context and no credential sharing.