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How to give an agent its own email inbox and webhook feed with Sentio

Run Sentio locally, confirm it is healthy, and follow the walkthrough to give one agent a real inbox.

Authorization notice. Sentio is dual-use. Only use it on software, sites and systems you own or have explicit permission to test.

Credentials. The compose stack seeds a publicly known admin API key with wildcard scope, so rotate it before the host is reachable by anyone else.

Who it is forA developer building an AI agent that must receive customer email threads, act on them, and reply as itself.

The problemWiring an IMAP poller, a parser and an SMTP relay together means inheriting a legacy mail server's operations.

The outcomeOne Sentio instance runs, and the agent receives inbound mail as webhooks and replies in-thread over REST.

What you need first

  • Docker Engine 24+ with the Compose plugin, about 4 GB RAM and 8 GB disk, or a Linux host with PostgreSQL 18+, Redis or Valkey, NATS with JetStream, and S3-compatible storage
  • A terminal and curl
  • Rotation of the bootstrap admin API key before the host is reachable by anyone else

Steps

  1. Run git clone https://github.com/truespar/sentio.git and then cd sentio.
  2. Run docker compose up -d to start Sentio with PostgreSQL, Redis, NATS/JetStream, SeaweedFS, ClamAV and rspamd.
  3. Run curl localhost:8080/health/ready and confirm it returns status ok for database and kv.
  4. Open the API reference at localhost:8080 or read /openapi.json to find the mailbox and webhook endpoints.
  5. Follow the README section 'Give an agent its own inbox' and register the agent's webhook URL.

Prompt for your agent

Clone the truespar/sentio repo, start it with docker compose up -d, and confirm localhost:8080/health/ready returns status ok. Then give the agent named <agent-name> its own inbox by following the README section 'Give an agent its own inbox', and report the mailbox address created. Verify that the webhook endpoint for <agent-name> is set before reporting success.

Caveat. The compose stack disables the bootstrap key guard, so the seeded admin key must be rotated and SENTIO_ALLOW_BOOTSTRAP_KEY removed before exposure.

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