# Send Email (remote · next.hal9.ai)

Send emails from natural language prompts.

- Trust score: 83/100 (high trust)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-21

## Components

- remote · `next.hal9.ai`: 83/100 (this document), [markdown](https://verifymcp.io/servers/hal9ai-send-email/mcp-mcpbuild-send-email.md), [page](https://verifymcp.io/servers/hal9ai-send-email/mcp-mcpbuild-send-email)

## Channel facts

- Endpoint: `https://next.hal9.ai/mcp/mcpbuild/send-email`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.0.2`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, 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 2026-09-21.

- **Endpoint Security**: 94/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation is enforced on tool calls, advertised via RFC 9728 protected-resource metadata. Discovery is public, which costs nothing: no tool can be invoked without a token.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
  - The authorisation server offers only Dynamic Client Registration (RFC 7591), which MCP 2026-07-28 deprecated in favour of Client ID Metadata Documents.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 69/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 70 tokens (~70/item across 1 items; 1 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 60/100
  - Stability observed for 18 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% 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 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation; "chat" implies "send" and declares no destructiveHint at all, which the MCP spec reads as destructive by default.
  - An AI judge read all 2 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the Send Email MCP server?

Send Email is a hosted endpoint at https://next.hal9.ai/mcp/mcpbuild/send-email, so there is nothing to install locally. 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 --transport http hal9ai-send-email 'https://next.hal9.ai/mcp/mcpbuild/send-email'
```

### Cursor

```json
{
  "mcpServers": {
    "hal9ai-send-email": {
      "url": "https://next.hal9.ai/mcp/mcpbuild/send-email"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "hal9ai-send-email": {
      "type": "http",
      "url": "https://next.hal9.ai/mcp/mcpbuild/send-email"
    }
  }
}
```

### Codex

```toml
[mcp_servers.hal9ai-send-email]
url = "https://next.hal9.ai/mcp/mcpbuild/send-email"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "hal9ai-send-email": {
      "type": "remote",
      "url": "https://next.hal9.ai/mcp/mcpbuild/send-email",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add hal9ai-send-email --url 'https://next.hal9.ai/mcp/mcpbuild/send-email' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  hal9ai-send-email:
    url: "https://next.hal9.ai/mcp/mcpbuild/send-email"
```

### Netclaw

```json
{
  "McpServers": {
    "hal9ai-send-email": {
      "Transport": "http",
      "Url": "https://next.hal9.ai/mcp/mcpbuild/send-email"
    }
  }
}
```

### Vellum

```bash
assistant mcp add hal9ai-send-email -t streamable-http -u 'https://next.hal9.ai/mcp/mcpbuild/send-email'
```

### Other

```json
{
  "mcpServers": {
    "hal9ai-send-email": {
      "type": "http",
      "url": "https://next.hal9.ai/mcp/mcpbuild/send-email"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## 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.

### 2026-09-20 (score 83, +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.

### 2026-09-17 (score 82, +1)

No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-15 (score 81, +1)

No change was recorded against any check on this day. Stability & Change Management went from 37 to 40. That category is still filling its 30-day observation window: 11 days of observed history at the previous scan, 12 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-13 (score 80, +1)

No change was recorded against any check on this day. Stability & Change Management went from 30 to 33. That category is still filling its 30-day observation window: 9 days of observed history at the previous scan, 10 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-11 (score 79, +1)

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-09 (score 78, +15)

- [security improvement] Authorization: unverified → pass
- [functional] Stability: fail → 0.20
- [functional] Server version: 9 → 10

### 2026-09-08 (score 63, −14)

- [security regression] Authorization: pass → unverified
- [security regression] Stability: 0.13 → fail

### 2026-09-07 (score 77, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (1)

### `chat` (~57 tokens)

Send Email

Send emails via Resend using natural language prompts

Input parameters:

- `chat_id` (string): Continue an existing conversation. Omit to start a new one; the reply includes the id.
- `message` (string, required): The message to send to the agent.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/hal9ai-send-email/mcp-mcpbuild-send-email#diagnostics

## Score history

- 2026-09-21: 83
- 2026-09-20: 83
- 2026-09-19: 82
- 2026-09-18: 82
- 2026-09-17: 82
- 2026-09-16: 81
- 2026-09-15: 81
- 2026-09-14: 80
- 2026-09-13: 80
- 2026-09-12: 79
- 2026-09-11: 79
- 2026-09-10: 78
- 2026-09-09: 78
- 2026-09-08: 63
- 2026-09-07: 77
- 2026-09-06: 76
- 2026-09-05: 76
- 2026-09-04: 75
- 2026-09-03: 75
- 2026-09-02: 38
- 2026-09-01: 38

## Common questions

### What is the Send Email MCP server?

Send Email is an MCP server listed in the public MCP registry as io.github.hal9ai/send-email. Send emails from natural language prompts. This page covers its hosted endpoint (https://next.hal9.ai/mcp/mcpbuild/send-email).

### Is the Send Email MCP server safe to use?

Send Email scores 83 out of 100 on VerifyMCP. 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 Send Email MCP server expose?

Send Email exposes 1 tool: chat. Their descriptions and schemas cost roughly 57 tokens of context every time the server is loaded.

### Does the Send Email MCP server require authentication?

Yes. Send Email asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.

### Is the Send Email MCP server still maintained?

Send Email is still listed as active in the MCP registry. We last reached this channel on 21 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://next.hal9.ai/mcp/mcpbuild/send-email
- Repository: https://github.com/hal9ai/mcp.build
- Website: https://mcp.build/send-email/
- Changelog RSS feed: https://verifymcp.io/servers/hal9ai-send-email/mcp-mcpbuild-send-email.xml
- Changelog JSON feed: https://verifymcp.io/servers/hal9ai-send-email/mcp-mcpbuild-send-email.json
- HTML version of this page: https://verifymcp.io/servers/hal9ai-send-email/mcp-mcpbuild-send-email