# Assistant Mail MCP (npm · @assistantmail/assistantmail-mcp)

Agent email with allowlist and consent via AssistantMail.

- Trust score: 83/100 (high trust)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-22

## Components

- npm · `@assistantmail/assistantmail-mcp`: 83/100 (this document), [markdown](https://verifymcp.io/servers/assistantmail-assistantmail-mcp/assistantmail-assistantmail-mcp.md), [page](https://verifymcp.io/servers/assistantmail-assistantmail-mcp/assistantmail-assistantmail-mcp)

## Channel facts

- Registry: `npm`
- Package: `@assistantmail/assistantmail-mcp`
- Version: `1.3.1`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-22.

- **Supply Chain Security**: 98/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - 31 of 95 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 97/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to AssistantMail/assistantmail-mcp).
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 11 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 62/100
  - AI-judged instruction clarity (fair).
  - Tool/resource definitions use about 868 tokens (~39/item across 22 items; 22 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 63/100
  - Stability observed for 19 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 67/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 0% of tool parameters carry a description.
- **Tool Safety**: 75/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - 0 of 5 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation; "assistantmail_delete_mailbox" implies "delete" and declares no destructiveHint at all, which the MCP spec reads as destructive by default.
  - An AI judge read all 22 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Assistant Mail MCP server?

Assistant Mail MCP runs locally as an npm package, launched with npx -y @assistantmail/assistantmail-mcp. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add assistantmail-assistantmail-mcp -- npx -y @assistantmail/assistantmail-mcp
```

### Cursor

```json
{
  "mcpServers": {
    "assistantmail-assistantmail-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@assistantmail/assistantmail-mcp"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "assistantmail-assistantmail-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@assistantmail/assistantmail-mcp"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add assistantmail-assistantmail-mcp -- npx -y @assistantmail/assistantmail-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "assistantmail-assistantmail-mcp": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@assistantmail/assistantmail-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add assistantmail-assistantmail-mcp --command npx --arg -y --arg @assistantmail/assistantmail-mcp
```

### Hermes

```yaml
mcp_servers:
  assistantmail-assistantmail-mcp:
    command: "npx"
    args: ["-y", "@assistantmail/assistantmail-mcp"]
```

### Netclaw

```json
{
  "McpServers": {
    "assistantmail-assistantmail-mcp": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "@assistantmail/assistantmail-mcp"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add assistantmail-assistantmail-mcp -t stdio -c npx -a -y @assistantmail/assistantmail-mcp
```

### Other

```json
{
  "mcpServers": {
    "assistantmail-assistantmail-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@assistantmail/assistantmail-mcp"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-22 (score 83, +1)

No change was recorded against any check on this day. Stability & Change Management went from 60 to 63. That category is still filling its 30-day observation window: 18 days of observed history at the previous scan, 19 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-20 (score 82, +1)

No change was recorded against any check on this day. Stability & Change Management went from 53 to 57. That category is still filling its 30-day observation window: 16 days of observed history at the previous scan, 17 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-18 (score 81, +1)

No change was recorded against any check on this day. Stability & Change Management went from 47 to 50. That category is still filling its 30-day observation window: 14 days of observed history at the previous scan, 15 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-16 (score 80, +1)

No change was recorded against any check on this day. Stability & Change Management went from 40 to 43. That category is still filling its 30-day observation window: 12 days of observed history at the previous scan, 13 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-14 (score 79, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-11 (score 78, +4)

- [functional improvement] Stability: unverified → 0.27

### 2026-09-03 (score 74)

First indexed and scored.

## MCP tools (22)

### `assistantmail_health` (~19 tokens)

Returns AssistantMail MCP server and API endpoint metadata.

### `assistantmail_get_me` (~29 tokens)

Gets account profile and tier metadata for the authenticated account.

Input parameters:

- `apiKey` (string)

### `assistantmail_get_inbound_policy` (~30 tokens)

Gets inbound email policy settings for the authenticated account.

Input parameters:

- `apiKey` (string)

### `assistantmail_update_inbound_policy` (~45 tokens)

Updates inbound email policy for the authenticated account.

Input parameters:

- `allowedSenders` (array)
- `apiKey` (string)
- `policy` (string, required)

### `assistantmail_create_mailbox` (~42 tokens)

Creates a mailbox for the authenticated account.

Input parameters:

- `address` (string)
- `apiKey` (string)
- `displayName` (string)

### `assistantmail_list_mailboxes` (~28 tokens)

Lists mailboxes accessible to the authenticated account.

Input parameters:

- `apiKey` (string)

### `assistantmail_get_mailbox` (~35 tokens)

Gets mailbox metadata for a mailbox ID.

Input parameters:

- `apiKey` (string)
- `mailboxId` (string, required)

### `assistantmail_update_mailbox` (~43 tokens)

Updates mailbox metadata (currently display name).

Input parameters:

- `apiKey` (string)
- `displayName` (string, required)
- `mailboxId` (string, required)

### `assistantmail_delete_mailbox` (~35 tokens)

Deletes a mailbox and all associated messages.

Input parameters:

- `apiKey` (string)
- `mailboxId` (string, required)

### `assistantmail_list_messages` (~49 tokens)

Lists inbound and outbound messages for a mailbox.

Input parameters:

- `apiKey` (string)
- `limit` (integer)
- `mailboxId` (string, required)
- `since` (string)

### `assistantmail_get_message` (~50 tokens)

Gets a specific message for a mailbox, including hydrated text/html bodies when available.

Input parameters:

- `apiKey` (string)
- `mailboxId` (string, required)
- `messageId` (string, required)

### `assistantmail_send_email` (~63 tokens)

Queues an outbound email for a mailbox.

Input parameters:

- `apiKey` (string)
- `html` (string)
- `mailboxId` (string, required)
- `subject` (string, required)
- `text` (string)
- `to` (string, required)

### `assistantmail_reply_message` (~58 tokens)

Replies to an existing message in a mailbox thread.

Input parameters:

- `apiKey` (string)
- `html` (string)
- `mailboxId` (string, required)
- `messageId` (string, required)
- `text` (string)

### `assistantmail_delete_messages` (~54 tokens)

Deletes messages from a mailbox by IDs or deletes all messages.

Input parameters:

- `apiKey` (string)
- `deleteAll` (boolean)
- `mailboxId` (string, required)
- `messageIds` (array)

### `assistantmail_get_usage` (~37 tokens)

Gets daily and monthly send quota usage for a mailbox.

Input parameters:

- `apiKey` (string)
- `mailboxId` (string, required)

### `assistantmail_list_recipients` (~30 tokens)

Lists approved/pending recipients for the authenticated account.

Input parameters:

- `apiKey` (string)

### `assistantmail_add_recipient` (~37 tokens)

Adds a recipient and sends a consent invitation when required.

Input parameters:

- `apiKey` (string)
- `email` (string, required)

### `assistantmail_remove_recipient` (~35 tokens)

Removes a recipient from the allowed recipient list.

Input parameters:

- `apiKey` (string)
- `email` (string, required)

### `assistantmail_send_email_reference` (~33 tokens)

Provides the AssistantMail REST endpoint and required headers for email send requests.

Input parameters:

- `mailboxId` (string, required)

### `assistantmail_list_messages_reference` (~38 tokens)

Provides the AssistantMail REST endpoint for listing messages (inbound and outbound) in a mailbox.

Input parameters:

- `mailboxId` (string, required)

### `assistantmail_get_message_reference` (~44 tokens)

Provides the AssistantMail REST endpoint for fetching a single message including its full body content.

Input parameters:

- `mailboxId` (string, required)
- `messageId` (string, required)

### `assistantmail_get_usage_reference` (~34 tokens)

Provides the AssistantMail REST endpoint for checking send quota usage for a mailbox.

Input parameters:

- `mailboxId` (string, required)

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/assistantmail-assistantmail-mcp/assistantmail-assistantmail-mcp#diagnostics

## Score history

- 2026-09-22: 83
- 2026-09-21: 82
- 2026-09-20: 82
- 2026-09-19: 81
- 2026-09-18: 81
- 2026-09-17: 80
- 2026-09-16: 80
- 2026-09-15: 79
- 2026-09-14: 79
- 2026-09-13: 78
- 2026-09-12: 78
- 2026-09-11: 78
- 2026-09-10: 74
- 2026-09-09: 74
- 2026-09-08: 74
- 2026-09-07: 74
- 2026-09-06: 74
- 2026-09-05: 74
- 2026-09-04: 74
- 2026-09-03: 74

## Common questions

### What is the Assistant Mail MCP server?

Assistant Mail MCP is listed in the public MCP registry as io.github.AssistantMail/assistantmail-mcp. Agent email with allowlist and consent via AssistantMail. This page covers its npm package (@assistantmail/assistantmail-mcp).

### Is the Assistant Mail MCP server safe to use?

Assistant Mail MCP scores 83 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 22 September 2026. It declares no install or post-install scripts. Its build provenance is signed and verified. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Assistant Mail MCP server expose?

Assistant Mail MCP exposes 22 tools: assistantmail_health, assistantmail_get_me, assistantmail_get_inbound_policy, assistantmail_update_inbound_policy, assistantmail_create_mailbox, and 17 more. Their descriptions and schemas cost roughly 868 tokens of context every time the server is loaded.

### Is the Assistant Mail MCP server still maintained?

Assistant Mail MCP is still listed as active in the MCP registry. We last reached this channel on 22 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the Assistant Mail MCP server under?

Assistant Mail MCP declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/@assistantmail/assistantmail-mcp
- Socket report: https://socket.dev/npm/package/@assistantmail/assistantmail-mcp
- Repository: https://github.com/AssistantMail/assistantmail-mcp
- Website: https://assistant-mail.ai/docs
- Changelog RSS feed: https://verifymcp.io/servers/assistantmail-assistantmail-mcp/assistantmail-assistantmail-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/assistantmail-assistantmail-mcp/assistantmail-assistantmail-mcp.json
- HTML version of this page: https://verifymcp.io/servers/assistantmail-assistantmail-mcp/assistantmail-assistantmail-mcp