Agent email infrastructure

Agents need email. They do not need a new email provider.

Claude Code, Codex, Hermes, and OpenHands all hit the same wall: OTPs, confirmations, replies, and long-running tasks live in email. Envelope connects those agents to your existing mailbox with CLI, JSON, and MCP.

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# Agent waits for a code
CODE=$(envelope code --wait 60)

# Agent reads mail as JSON
envelope inbox --json

# Agent gets MCP tools
envelope mcp --config

BYO beats provisioned inboxes.

Provisioned agent inboxes are fine for greenfield workflows. Real work usually happens on addresses people already know. Envelope lets the agent operate where the work already is.

Harnesses

Claude Code
OpenAI Codex
Hermes
OpenHands
OpenClaw / OCPlatform

The primitives agents actually use

OTP Relay

Block until a code arrives from a sender your mail provider authenticated, then return it to the agent. How the check works.

Inbox watch

Use IMAP IDLE instead of brittle polling loops.

Reviewable actions

Drafts and rules can be inspected before they change the mailbox. Make an agent ask before it sends.