Agent Skills: agentmail

Troubleshooting

If requests fail, run zero doctor check-connector --env-name AGENTMAIL_TOKEN or zero doctor check-connector --url https://api.agentmail.to/v0/inboxes --method POST

Scenarios

1. Customer Support Agent

An AI agent handles inbound support emails automatically.

1. Create a dedicated inbox for support: POST /v0/inboxes with username: "support"
2. Register a webhook listening for message.received: POST /v0/webhooks with inbox_ids scoped to the support inbox
3. When a customer emails support@agentmail.to, the webhook fires with the message payload
4. Read the full thread for context: GET /v0/inboxes/{inbox-id}/threads/{thread-id}
5. Generate a response with your LLM, then reply in-thread: POST /v0/inboxes/{inbox-id}/messages/{message-id}/reply
6. Update labels to track state: PATCH /v0/inboxes/{inbox-id}/messages/{message-id} with add_labels: ["replied"], remove_labels: ["unreplied"]
7. Periodically check for stale threads: GET /v0/inboxes/{inbox-id}/threads?labels=unreplied to find conversations that still need attention

2. Sales Outreach with Scheduled Follow-ups

An AI agent sends personalized cold emails and manages follow-up sequences.

1. Create an inbox per sales campaign: POST /v0/inboxes with client_id: "campaign-q1" for idempotency
2. Send initial outreach: POST /v0/inboxes/{inbox-id}/messages/send with personalized subject/body
3. Create scheduled follow-up drafts for non-responders: POST /v0/inboxes/{inbox-id}/drafts with send_at set to 3 days later
4. Register a webhook for message.received to detect replies
5. When a prospect replies, cancel the scheduled draft: DELETE /v0/inboxes/{inbox-id}/drafts/{draft-id}
6. Monitor delivery health: GET /v0/metrics?event_types=message.bounced&event_types=message.complained to detect reputation issues early

3. Document Processing Pipeline

An AI agent receives documents via email, processes them, and sends results back.

1. Create an inbox: POST /v0/inboxes with username: "doc-processor"
2. Set up a webhook for message.received
3. When an email arrives with attachments, the webhook payload includes attachment metadata
4. Download the attachment: GET /v0/inboxes/{inbox-id}/messages/{message-id}/attachments/{attachment-id} → returns a temporary download_url
5. Download and process the file (OCR, summarization, data extraction, etc.)
6. Reply with results: POST /v0/inboxes/{inbox-id}/messages/{message-id}/reply including processed output in the body or a new attachment

4. Multi-Agent Team Coordination

Multiple AI agents each have their own inbox, organized by team.

1. Create a pod for the team: POST /v0/pods with name: "Research Team"
2. Create an inbox per agent with pod_id: POST /v0/inboxes for each agent (e.g. researcher-1, researcher-2, summarizer)
3. Set up per-inbox webhooks to route events to each agent's handler: POST /v0/webhooks with inbox_ids scoped per agent
4. Agents send emails to each other using their @agentmail.to addresses for inter-agent communication
5. List all inboxes in the pod for oversight: GET /v0/inboxes filtered by pod

5. Human-in-the-Loop Draft Approval

An AI agent drafts emails for human review before sending.

1. Create a draft with the AI-generated content: POST /v0/inboxes/{inbox-id}/drafts
2. Notify the human reviewer (via Slack, UI, etc.) with the draft ID
3. Human reviews the draft: GET /v0/inboxes/{inbox-id}/drafts/{draft-id}
4. If approved, send the draft: POST /v0/inboxes/{inbox-id}/drafts/{draft-id}/send
5. If changes needed, update and re-review: PATCH /v0/inboxes/{inbox-id}/drafts/{draft-id} with revised content
6. If rejected, delete the draft: DELETE /v0/inboxes/{inbox-id}/drafts/{draft-id}

6. Ephemeral Inboxes for One-off Tasks

Create disposable inboxes for short-lived tasks, then clean up.

1. Create a temporary inbox with client_id tied to the task ID: POST /v0/inboxes with client_id: "task-abc123"
2. Use the inbox to send/receive emails for this specific task (e.g. verifying an account, requesting info from an external party)
3. Poll or webhook for responses
4. When the task is complete, delete the inbox: DELETE /v0/inboxes/{inbox-id} — all associated threads and messages are cleaned up

7. Email Monitoring and Analytics

Track email delivery health across all agent inboxes.

1. Query delivery metrics over a time range: GET /v0/metrics?start_timestamp=...&end_timestamp=...
2. Filter by event type to find problems: GET /v0/metrics?event_types=message.bounced&event_types=message.rejected
3. If bounce rates are high, investigate specific inboxes using GET /v0/inboxes/{inbox-id}/messages?labels=bounced
4. Set up a webhook for message.bounced and message.complained to get real-time alerts on deliverability issues

8. Inbound Lead Qualification

An AI agent triages inbound emails and routes them appropriately.

1. Create an inbox as the public-facing entry point: POST /v0/inboxes with username: "hello"
2. Register a webhook for message.received
3. When a new email arrives, use your LLM to classify intent (sales inquiry, support request, partnership, spam)
4. Label the message by category: PATCH /v0/inboxes/{inbox-id}/messages/{message-id} with add_labels: ["sales-lead"]
5. Send an auto-acknowledgment: POST /v0/inboxes/{inbox-id}/messages/{message-id}/reply
6. Forward to the right team by sending a new email from a different inbox or notifying via webhook
7. Review unhandled messages: GET /v0/inboxes/{inbox-id}/messages?labels=needs-review

Inboxes

Create Inbox

curl -s -X POST "https://api.agentmail.to/v0/inboxes" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d '{"username": "my-agent", "display_name": "My Agent"}' | jq .

Create with idempotent client_id (safe to retry without creating duplicates):

curl -s -X POST "https://api.agentmail.to/v0/inboxes" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d '{"username": "my-agent", "display_name": "My Agent", "client_id": "my-agent-inbox"}' | jq .

List Inboxes

curl -s "https://api.agentmail.to/v0/inboxes" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

With pagination:

curl -s "https://api.agentmail.to/v0/inboxes?limit=10" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Get Inbox

curl -s "https://api.agentmail.to/v0/inboxes/{inbox-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Update Inbox

curl -s -X PATCH "https://api.agentmail.to/v0/inboxes/{inbox-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d '{"display_name": "New Name"}' | jq .

Delete Inbox

curl -s -X DELETE "https://api.agentmail.to/v0/inboxes/{inbox-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN"

Messages

Send Email

Write to /tmp/agentmail_request.json:

{
  "to": ["recipient@example.com"],
  "subject": "Hello from my agent",
  "text": "Plain text body",
  "html": "<p>HTML body</p>"
}

Then run:

curl -s -X POST "https://api.agentmail.to/v0/inboxes/{inbox-id}/messages/send" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/agentmail_request.json' | jq .

Send Email with CC/BCC

Write to /tmp/agentmail_request.json:

{
  "to": ["recipient@example.com"],
  "cc": ["cc@example.com"],
  "bcc": ["bcc@example.com"],
  "subject": "Hello",
  "text": "Plain text body",
  "html": "<p>HTML body</p>"
}

Then run:

curl -s -X POST "https://api.agentmail.to/v0/inboxes/{inbox-id}/messages/send" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/agentmail_request.json' | jq .

Send Email with Labels

Write to /tmp/agentmail_request.json:

{
  "to": ["recipient@example.com"],
  "subject": "Hello",
  "text": "Plain text body",
  "labels": ["outreach", "onboarding"]
}

Then run:

curl -s -X POST "https://api.agentmail.to/v0/inboxes/{inbox-id}/messages/send" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/agentmail_request.json' | jq .

Send Email with Attachment

Write to /tmp/agentmail_request.json:

{
  "to": ["recipient@example.com"],
  "subject": "Report attached",
  "text": "Please find the report attached.",
  "attachments": [
    {
      "filename": "report.txt",
      "content_type": "text/plain",
      "content": "<base64-encoded-content>"
    }
  ]
}

Then run:

curl -s -X POST "https://api.agentmail.to/v0/inboxes/{inbox-id}/messages/send" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/agentmail_request.json' | jq .

To base64 encode a file:

base64 -w 0 /path/to/file.pdf

Reply to Message

Write to /tmp/agentmail_request.json:

{
  "text": "Thanks for your message!",
  "html": "<p>Thanks for your message!</p>"
}

Then run:

curl -s -X POST "https://api.agentmail.to/v0/inboxes/{inbox-id}/messages/{message-id}/reply" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/agentmail_request.json' | jq .

Reply All

Write to /tmp/agentmail_request.json:

{
  "reply_all": true,
  "text": "Thanks everyone!",
  "html": "<p>Thanks everyone!</p>"
}

Then run:

curl -s -X POST "https://api.agentmail.to/v0/inboxes/{inbox-id}/messages/{message-id}/reply" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/agentmail_request.json' | jq .

List Messages

curl -s "https://api.agentmail.to/v0/inboxes/{inbox-id}/messages" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

With filters:

curl -s "https://api.agentmail.to/v0/inboxes/{inbox-id}/messages?labels=unreplied&limit=10" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Get Message

curl -s "https://api.agentmail.to/v0/inboxes/{inbox-id}/messages/{message-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Update Message Labels

Write to /tmp/agentmail_request.json:

{
  "add_labels": ["replied"],
  "remove_labels": ["unreplied"]
}

Then run:

curl -s -X PATCH "https://api.agentmail.to/v0/inboxes/{inbox-id}/messages/{message-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/agentmail_request.json' | jq .

Get Message Attachment

curl -s "https://api.agentmail.to/v0/inboxes/{inbox-id}/messages/{message-id}/attachments/{attachment-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Returns a download_url (temporary pre-signed URL) and expires_at. Download the file:

curl -s -o attachment.bin "{download-url}"

Threads

List Threads

curl -s "https://api.agentmail.to/v0/inboxes/{inbox-id}/threads" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

With filters:

curl -s "https://api.agentmail.to/v0/inboxes/{inbox-id}/threads?labels=unreplied&after=2025-01-01T00:00:00Z&limit=10" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Get Thread

Returns thread with all messages ordered by timestamp ascending:

curl -s "https://api.agentmail.to/v0/inboxes/{inbox-id}/threads/{thread-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Get Thread Attachment

curl -s "https://api.agentmail.to/v0/inboxes/{inbox-id}/threads/{thread-id}/attachments/{attachment-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Delete Thread

curl -s -X DELETE "https://api.agentmail.to/v0/inboxes/{inbox-id}/threads/{thread-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN"

Drafts

Create Draft

Write to /tmp/agentmail_request.json:

{
  "to": ["recipient@example.com"],
  "subject": "Draft email",
  "text": "This is a draft.",
  "html": "<p>This is a draft.</p>"
}

Then run:

curl -s -X POST "https://api.agentmail.to/v0/inboxes/{inbox-id}/drafts" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/agentmail_request.json' | jq .

Create Scheduled Draft

Write to /tmp/agentmail_request.json:

{
  "to": ["recipient@example.com"],
  "subject": "Scheduled email",
  "text": "This will be sent later.",
  "send_at": "2025-12-01T10:00:00Z"
}

Then run:

curl -s -X POST "https://api.agentmail.to/v0/inboxes/{inbox-id}/drafts" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/agentmail_request.json' | jq .

List Drafts

curl -s "https://api.agentmail.to/v0/inboxes/{inbox-id}/drafts" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Get Draft

curl -s "https://api.agentmail.to/v0/inboxes/{inbox-id}/drafts/{draft-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Update Draft

Write to /tmp/agentmail_request.json:

{
  "subject": "Updated subject",
  "text": "Updated body"
}

Then run:

curl -s -X PATCH "https://api.agentmail.to/v0/inboxes/{inbox-id}/drafts/{draft-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/agentmail_request.json' | jq .

Send Draft

curl -s -X POST "https://api.agentmail.to/v0/inboxes/{inbox-id}/drafts/{draft-id}/send" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d '{}' | jq .

Delete Draft

curl -s -X DELETE "https://api.agentmail.to/v0/inboxes/{inbox-id}/drafts/{draft-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN"

Webhooks

Create Webhook

Write to /tmp/agentmail_request.json:

{
  "url": "https://your-server.com/webhooks",
  "event_types": ["message.received", "message.sent", "message.delivered"],
  "client_id": "my-webhook"
}

Then run:

curl -s -X POST "https://api.agentmail.to/v0/webhooks" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/agentmail_request.json' | jq .

Supported event types: message.received, message.sent, message.delivered, message.bounced, message.complained, message.rejected, domain.verified

Create Webhook for Specific Inboxes

Write to /tmp/agentmail_request.json:

{
  "url": "https://your-server.com/webhooks",
  "event_types": ["message.received"],
  "inbox_ids": ["{inbox-id-1}", "{inbox-id-2}"],
  "client_id": "inbox-webhook"
}

Then run:

curl -s -X POST "https://api.agentmail.to/v0/webhooks" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/agentmail_request.json' | jq .

List Webhooks

curl -s "https://api.agentmail.to/v0/webhooks" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Get Webhook

curl -s "https://api.agentmail.to/v0/webhooks/{webhook-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Update Webhook (Add/Remove Inboxes)

Write to /tmp/agentmail_request.json:

{
  "add_inbox_ids": ["{new-inbox-id}"],
  "remove_inbox_ids": ["{old-inbox-id}"]
}

Then run:

curl -s -X PATCH "https://api.agentmail.to/v0/webhooks/{webhook-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d @/tmp/agentmail_request.json' | jq .

Delete Webhook

curl -s -X DELETE "https://api.agentmail.to/v0/webhooks/{webhook-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN"

Domains

Create Domain

curl -s -X POST "https://api.agentmail.to/v0/domains" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d '{"domain": "yourdomain.com", "feedback_enabled": true}' | jq .

Returns DNS records (TXT, CNAME, MX) that must be added to your DNS provider.

List Domains

curl -s "https://api.agentmail.to/v0/domains" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Get Domain

curl -s "https://api.agentmail.to/v0/domains/{domain-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Verify Domain

Trigger DNS verification after adding records:

curl -s -X POST "https://api.agentmail.to/v0/domains/{domain-id}/verify" --header "Authorization: Bearer $AGENTMAIL_TOKEN"

Domain status values: NOT_STARTED, PENDING, INVALID, FAILED, VERIFYING, VERIFIED

Delete Domain

curl -s -X DELETE "https://api.agentmail.to/v0/domains/{domain-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN"

Pods

Pods are organizational groups for inboxes.

Create Pod

curl -s -X POST "https://api.agentmail.to/v0/pods" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d '{"name": "Support Team", "client_id": "support-pod"}' | jq .

List Pods

curl -s "https://api.agentmail.to/v0/pods" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Get Pod

curl -s "https://api.agentmail.to/v0/pods/{pod-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Delete Pod

curl -s -X DELETE "https://api.agentmail.to/v0/pods/{pod-id}" --header "Authorization: Bearer $AGENTMAIL_TOKEN"

Metrics

Get Delivery Metrics

curl -s "https://api.agentmail.to/v0/metrics?start_timestamp=2025-01-01T00:00:00Z&end_timestamp=2025-12-31T23:59:59Z" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Filter by event type:

curl -s "https://api.agentmail.to/v0/metrics?start_timestamp=2025-01-01T00:00:00Z&end_timestamp=2025-12-31T23:59:59Z&event_types=message.sent&event_types=message.bounced" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Supported event types: message.sent, message.delivered, message.bounced, message.delayed, message.rejected, message.complained, message.received

API Keys

List API Keys

curl -s "https://api.agentmail.to/v0/api-keys" --header "Authorization: Bearer $AGENTMAIL_TOKEN" | jq .

Create API Key

curl -s -X POST "https://api.agentmail.to/v0/api-keys" --header "Authorization: Bearer $AGENTMAIL_TOKEN" --header "Content-Type: application/json" -d '{"name": "production-key"}' | jq .

The api_key value is only returned once at creation time. Save it immediately.

Delete API Key

curl -s -X DELETE "https://api.agentmail.to/v0/api-keys/{api-key}" --header "Authorization: Bearer $AGENTMAIL_TOKEN"

Webhook Event Payload

When a webhook fires, AgentMail sends a POST request with this JSON payload:

{
  "type": "event",
  "event_type": "message.received",
  "event_id": "unique-event-id",
  "message": {
    "inbox_id": "...",
    "thread_id": "...",
    "message_id": "...",
    "from": "sender@example.com",
    "to": ["your-inbox@agentmail.to"],
    "subject": "Hello",
    "text": "Message body",
    "html": "<p>Message body</p>",
    "attachments": []
  },
  "thread": {
    "thread_id": "...",
    "subject": "Hello",
    "message_count": 1
  }
}

Your endpoint should return HTTP 200 immediately and process the payload asynchronously.

Send Parameters Reference

| Parameter | Type | Description | |-----------|------|-------------| | to | string[] | Recipients | | cc | string[] | CC recipients | | bcc | string[] | BCC recipients | | reply_to | string[] | Reply-to addresses | | subject | string | Email subject | | text | string | Plain text body | | html | string | HTML body | | labels | string[] | Custom labels | | attachments | object[] | Attachments (with filename, content_type, content as base64 or url) | | headers | object | Custom email headers |

Response Codes

| Status | Description | |--------|-------------| | 200 | Success | | 202 | Accepted (async delete for inboxes, threads) | | 204 | No Content (delete success for webhooks, pods, API keys) | | 400 | Invalid parameters | | 403 | Forbidden (sending not allowed) | | 404 | Resource not found |

Guidelines

1. Always send both text and HTML: Provide both formats for best deliverability across email clients
2. Use client_id for idempotency: When creating inboxes, webhooks, or drafts, use client_id to prevent duplicates on retries
3. Use labels for state tracking: Tag messages as unreplied/replied to manage conversation state
4. Use webhooks over polling: Webhooks are the recommended way to handle incoming emails in production
5. Custom domains improve deliverability: Set up verified custom domains for production use
6. Default domain: Without a custom domain, inboxes use @agentmail.to
7. Webhook response: Return HTTP 200 immediately from webhook endpoints; process payloads asynchronously

API Reference

• Documentation: https://docs.agentmail.to
• API Reference: https://docs.agentmail.to/api-reference/inboxes/list
• Console: https://console.agentmail.to
• Quickstart: https://docs.agentmail.to/quickstart
• Node.js SDK: https://www.npmjs.com/package/agentmail
• Python SDK: pip install agentmail