agentmail

AgentMail — Agent-Owned Email Inboxes

Requirements

• AgentMail API key (required) — sign up at https://console.agentmail.to (free tier: 3 inboxes, 3,000 emails/month; paid plans from $20/mo)
• Node.js 18+ (for the MCP server)

When to Use

Use this skill when you need to:

• Give the agent its own dedicated email address
• Send emails autonomously on behalf of the agent
• Receive and read incoming emails
• Manage email threads and conversations
• Sign up for services or authenticate via email
• Communicate with other agents or humans via email

This is NOT for reading the user's personal email (use himalaya or Gmail for that). AgentMail gives the agent its own identity and inbox.

Setup

1. Get an API Key

• Go to https://console.agentmail.to
• Create an account and generate an API key (starts with

  am_

  )

2. Configure MCP Server

Add to

~/.hermes/config.yaml

mcp_servers:
  agentmail:
    command: "npx"
    args: ["-y", "agentmail-mcp"]
    env:
      AGENTMAIL_API_KEY: "am_your_key_here"

3. Restart Hermes

hermes

All 11 AgentMail tools are now available automatically.

Available Tools (via MCP)

list_inboxes

get_inbox

create_inbox

delete_inbox

list_threads

get_thread

send_message

reply_to_message

forward_message

update_message

get_attachment

Procedure

Create an inbox and send an email

1. Create a dedicated inbox:
   • Use

     create_inbox

     with a username (e.g.

     hermes-agent

     )
   • The agent gets address:

     hermes-agent@agentmail.to

2. Send an email:
   • Use

     send_message

     with

     inbox_id

     ,

     to

     ,

     subject

     ,

     text

3. Check for replies:
   • Use

     list_threads

     to see incoming conversations
   • Use

     get_thread

     to read a specific thread

Check incoming email

1. Use

   list_inboxes

   to find your inbox ID
2. Use

   list_threads

   with the inbox ID to see conversations
3. Use

   get_thread

   to read a thread and its messages

Reply to an email

1. Get the thread with

   get_thread

2. Use

   reply_to_message

   with the message ID and your reply text

Example Workflows

Sign up for a service:

1. create_inbox (username: "signup-bot")
2. Use the inbox address to register on the service
3. list_threads to check for verification email
4. get_thread to read the verification code

Agent-to-human outreach:

1. create_inbox (username: "hermes-outreach")
2. send_message (to: user@example.com, subject: "Hello", text: "...")
3. list_threads to check for replies

Pitfalls

• Free tier limited to 3 inboxes and 3,000 emails/month
• Emails come from

  @agentmail.to

  domain on free tier (custom domains on paid plans)
• Node.js (18+) is required for the MCP server (

  npx -y agentmail-mcp

  )
• The

  mcp

  Python package must be installed:

  pip install mcp

• Real-time inbound email (webhooks) requires a public server — use

  list_threads

  polling via cronjob instead for personal use

Verification

After setup, test with:

hermes --toolsets mcp -q "Create an AgentMail inbox called test-agent and tell me its email address"

You should see the new inbox address returned.

References

• AgentMail docs: https://docs.agentmail.to/
• AgentMail console: https://console.agentmail.to
• AgentMail MCP repo: https://github.com/agentmail-to/agentmail-mcp
• Pricing: https://www.agentmail.to/pricing