# How to Use the AgenticMail Plugin for Email‑Based Coordination

> Learn to use the AgenticMail plugin for AI email coordination. Claude assistants can read, compose, and send emails, enabling distributed workflows via a shared inbox. Get started today.

- Repository: [Anthropic/claude-plugins-community](https://github.com/anthropics/claude-plugins-community)
- Tags: how-to-guide
- Published: 2026-09-09

---

**The AgenticMail plugin enables Claude assistants to read, compose, and send emails through SMTP/IMAP connections, allowing multiple AI agents to coordinate distributed workflows via a shared inbox.**

The **AgenticMail** plugin extends Claude’s capabilities with full email integration, enabling sophisticated multi‑agent coordination through standard email protocols. Available through the `anthropics/claude-plugins-community` repository, this plugin exposes a clean OpenAPI interface for listing threads, reading messages, and sending replies. By leveraging the plugin architecture defined in [`.claude-plugin/marketplace.json`](https://github.com/anthropics/claude-plugins-community/blob/main/.claude-plugin/marketplace.json), you can enable email‑based workflows that let distributed agents share status updates and delegate tasks asynchronously.

## Installing and Enabling the AgenticMail Plugin

### Plugin Discovery in the Marketplace

The Claude runtime discovers AgenticMail through the centralized marketplace registry. In the `anthropics/claude-plugins-community` repository, the file [`.claude-plugin/marketplace.json`](https://github.com/anthropics/claude-plugins-community/blob/main/.claude-plugin/marketplace.json) contains the canonical entry for the plugin at lines 756–765, specifying the source Git URL (`https://github.com/agenticmail/agenticmail.git`) and homepage metadata. Additionally, [`.github/owner-baseline.json`](https://github.com/anthropics/claude-plugins-community/blob/main/.github/owner-baseline.json) at line 194 records the plugin name for compliance verification.

To enable the plugin in a Claude session using the Python SDK:

```python
from claude import ClaudeClient

client = ClaudeClient(api_key="YOUR_CLAUDE_API_KEY")
client.enable_plugin("agenticmail")  # Loads OpenAPI spec from the repository

```

## Configuring SMTP and IMAP Authentication

AgenticMail requires valid **SMTP** and **IMAP** credentials to interact with mail servers. These credentials are supplied via your Claude settings or a hidden `.env` file—the repository itself contains no hardcoded secrets. At runtime, the plugin reads these credentials from the secure environment context, ensuring passwords never appear in source code or logs.

## Core Email Operations

The plugin exposes three primary operations through its OpenAPI specification, allowing Claude to invoke functions with typed JSON arguments.

### Listing Active Threads with `list_threads`

The `list_threads` operation returns the IDs of recent email threads available for processing. This allows agents to poll for new coordination messages without retrieving full message bodies.

```python
message = client.run_plugin(
    plugin="agenticmail",
    operation="list_threads",
    arguments={}
)
print("Open threads:", message["thread_ids"])

```

### Reading Messages with `read_message`

Use the `read_message` operation to retrieve the full body of a specific email by providing its `thread_id`. This returns the complete message content including headers and text body.

```python
thread_id = "abcd1234"
message = client.run_plugin(
    plugin="agenticmail",
    operation="read_message",
    arguments={"thread_id": thread_id}
)
print(message["body"])

```

### Sending Replies with `send_reply`

The `send_reply` operation transmits new email messages, optionally including attachments or structured summaries. This enables agents to post status updates and delegate subsequent tasks.

```python
client.run_plugin(
    plugin="agenticmail",
    operation="send_reply",
    arguments={
        "thread_id": thread_id,
        "subject": "Re: Project Update",
        "body": """\
Hi team,

Here's the current status:
- Data ingest: 95%
- Model training: pending

Next steps:
1. Start model training (Agent B)
2. Review metrics (Agent C)

Thanks,
Agent A
""",
        "attachments": []
    }
)

```

## Implementing Multi‑Agent Coordination Workflows

Email‑based coordination relies on a shared "coordination inbox" where agents post updates and read statuses. Because the plugin operates within Claude’s security sandbox, all traffic is logged and auditable.

A typical three‑agent workflow proceeds as follows:

1. **Agent A** posts a status update describing completed work using `send_reply`
2. **Agent B** polls `list_threads` to discover new messages, calls `read_message` to parse the status, performs its assigned task, and uses `send_reply` to report completion
3. **Agent C** monitors the thread for specific completion keywords before proceeding with final validation

```python

# Agent A posts initial status

agent_a.send_status_update()

# Agent B reads and responds

status = agent_b.read_current_status()
if status["model_training"] == "pending":
    agent_b.execute_training()
    agent_b.reply_with_progress_update()

# Agent C waits for completion notification

while not agent_c.check_thread_contains("training complete"):
    time.sleep(30)

```

## Error Handling and Reliability

Each endpoint returns a standardized error object containing `code` and `message` fields. Claude automatically retries transient network failures, such as temporary IMAP connection drops, and surfaces concise explanations for permanent errors—for example, "mailbox not found" or authentication failures.

## Summary

- The **AgenticMail** plugin is registered in [`.claude-plugin/marketplace.json`](https://github.com/anthropics/claude-plugins-community/blob/main/.claude-plugin/marketplace.json) (lines 756–765) and tracked in [`.github/owner-baseline.json`](https://github.com/anthropics/claude-plugins-community/blob/main/.github/owner-baseline.json) (line 194) of the `anthropics/claude-plugins-community` repository
- Enable the plugin via `client.enable_plugin("agenticmail")` to load the OpenAPI specification from `https://github.com/agenticmail/agenticmail.git`
- Configure **SMTP/IMAP** credentials through Claude settings; the plugin reads these at runtime without exposing them in code
- Use **`list_threads`** to poll for new messages, **`read_message`** to retrieve content, and **`send_reply`** to send updates and coordinate tasks
- Multi‑agent coordination works through a shared inbox where agents asynchronously post and consume status updates
- Standardized error objects with `code` and `message` enable automatic retry logic for transient failures while surfacing permanent errors to users

## Frequently Asked Questions

### What authentication does AgenticMail require?

AgenticMail requires standard **SMTP** and **IMAP** credentials to send and receive emails. You provide these through Claude’s secure settings interface or environment variables; the plugin never stores credentials in the repository or exposes them in source code.

### Can multiple Claude instances use the same inbox simultaneously?

Yes. Multiple agents can coordinate through a single shared inbox by using `list_threads` to discover new messages and `send_reply` to post updates. Each agent should implement polling logic to check for new threads periodically.

### Where is the AgenticMail plugin defined in the repository?

The plugin entry is located in [`.claude-plugin/marketplace.json`](https://github.com/anthropics/claude-plugins-community/blob/main/.claude-plugin/marketplace.json) at lines 756–765, which specifies the source Git URL and metadata. The plugin name is also recorded in [`.github/owner-baseline.json`](https://github.com/anthropics/claude-plugins-community/blob/main/.github/owner-baseline.json) at line 194 for baseline compliance tracking.

### How does the plugin handle email sending failures?

The plugin returns structured error objects with `code` and `message` fields. Claude’s runtime automatically retries transient network errors, such as temporary connection timeouts, and surfaces permanent errors—like authentication failures—directly to the user with descriptive messages.