# SMTPing Email Verification (npm · @smtping/mcp)

Verify email addresses, clean lists and check spamtrap, disposable, spambot and complainer lists.

- Trust score: 89/100 (high trust)
- Change this week: 0
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `mcp.smtping.com`: 38/100, [markdown](https://verifymcp.io/servers/smtping-smtping-mcp/mcp.md), [page](https://verifymcp.io/servers/smtping-smtping-mcp/mcp)
- npm · `@smtping/mcp`: 89/100 (this document), [markdown](https://verifymcp.io/servers/smtping-smtping-mcp/smtping-mcp.md), [page](https://verifymcp.io/servers/smtping-smtping-mcp/smtping-mcp)

## Channel facts

- Registry: `npm`
- Package: `@smtping/mcp`
- Version: `1.0.1`
- 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 2026-11-05.

- **Supply Chain Security**: 81/100
  - No malware found by supply-chain analysis.
  - CVE check failed: a known high-severity CVE affects zod 3.25.76, a direct dependency. A fixed version is available.
  - No install/post-install scripts declared.
  - 30 of 94 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 97/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to smtping/smtping-mcp).
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 9 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 74/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 294 tokens (~58/item across 5 items; 5 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 100/100
  - No destabilizing schema changes in the last 30 days.
- **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**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 5 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 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 SMTPing Email Verification MCP server?

SMTPing Email Verification runs locally as an npm package, launched with npx -y @smtping/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 smtping-smtping-mcp -- npx -y @smtping/mcp
```

### Cursor

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

### VS Code

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

### Codex

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

### opencode

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

### OpenClaw

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

### Hermes

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

### Netclaw

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

### Vellum

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

### Other

```json
{
  "mcpServers": {
    "smtping-smtping-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@smtping/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.

### 2026-11-03 (score 89, 0)

- [security] Stability: 0.97 → pass

### 2026-11-02 (score 89, 0)

- [functional] Stability: pass → 0.97

### 2026-10-30 (score 89, 0)

- [functional regression] Security disclosure: unverified → fail

### 2026-10-28 (score 89, 0)

- [functional regression] Security disclosure: fail → unverified

### 2026-10-27 (score 89, +15)

- [security improvement] Malware scan: unverified → pass
- [security] Stability: 0.97 → pass

### 2026-10-26 (score 74, −4)

- [security regression] Malware scan: pass → unverified
- [security improvement] Provenance: fail → pass
- [security] The attested source repository moved: smtping/smtping-mcp
- [functional] Package version: 1.0.0 → 1.0.1

### 2026-10-25 (score 78, +1)

No change was recorded against any check on this day. Stability & Change Management went from 90 to 93. That category is still filling its 30-day observation window: 27 days of observed history at the previous scan, 28 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-24 (score 77, −5)

- [security regression] CVE-2023-54404 affects this package: high
- [security regression] Known CVEs: pass → fail

## MCP tools (5)

### `verify_email` (~70 tokens)

Verify an email address

Verifies one email address with SMTPing. Returns a status (valid, invalid, catch_all, spamtrap, disposable, etc.) and a band: safe (send), avoid (remove) or judgement (your call). Costs 1 credit.

Input parameters:

- `email` (string, required): The email address to verify

### `verify_list` (~105 tokens)

Verify a list of email addresses

Verifies a list of addresses as one SMTPing bulk job (deduplicated, up to 100,000). Waits up to 120 seconds; if the job is still running, returns a job_id to pass to get_bulk_job later. Costs 1 credit per unique address.

Input parameters:

- `emails` (array, required): Email addresses to verify
- `wait_seconds` (integer): How long to wait for results. Default 120. Use 0 to only start the job.

### `get_bulk_job` (~42 tokens)

Get a bulk job

Returns the progress of a SMTPing bulk job, and its results once it has succeeded.

Input parameters:

- `job_id` (string, required): The job_id returned by verify_list

### `check_threat` (~56 tokens)

Check a threat list

Looks up one address in a single SMTPing threat list: spamtrap, disposable, spambot or complainer.

Input parameters:

- `email` (string, required): The email address to check
- `list` (string, required): Which list to check

### `get_credits` (~21 tokens)

Get remaining credits

Returns the remaining SMTPing credit balance and plan. Free.

## Diagnostics

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

## Score history

- 2026-11-05: 89
- 2026-11-04: 89
- 2026-11-03: 89
- 2026-11-02: 89
- 2026-11-01: 89
- 2026-10-31: 89
- 2026-10-30: 89
- 2026-10-29: 89
- 2026-10-28: 89
- 2026-10-27: 89
- 2026-10-26: 74
- 2026-10-25: 78
- 2026-10-24: 77
- 2026-10-23: 82
- 2026-10-22: 81
- 2026-10-21: 81
- 2026-10-20: 81
- 2026-10-19: 80
- 2026-10-18: 80
- 2026-10-17: 79
- 2026-10-16: 79
- 2026-10-15: 78
- 2026-10-14: 78
- 2026-10-13: 77
- 2026-10-12: 77
- 2026-10-08: 75
- 2026-10-06: 74
- 2026-10-04: 70
- 2026-10-03: 70
- 2026-10-02: 70

## Common questions

### What is the SMTPing Email Verification MCP server?

SMTPing Email Verification is an MCP server listed in the public MCP registry as io.github.smtping/smtping-mcp. Verify email addresses, clean lists and check spamtrap, disposable, spambot and complainer lists. This page covers its npm package (@smtping/mcp).

### Is the SMTPing Email Verification MCP server safe to use?

SMTPing Email Verification scores 89 out of 100 on VerifyMCP. We recorded 1 known advisory against it as of 5 November 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 SMTPing Email Verification MCP server expose?

SMTPing Email Verification exposes 5 tools: verify_email, verify_list, get_bulk_job, check_threat, get_credits. Their descriptions and schemas cost roughly 294 tokens of context every time the server is loaded.

### Is the SMTPing Email Verification MCP server still maintained?

SMTPing Email Verification is still listed as active in the MCP registry. We last reached this channel on 5 November 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 SMTPing Email Verification MCP server under?

SMTPing Email Verification 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/@smtping/mcp
- Socket report: https://socket.dev/npm/package/@smtping/mcp
- Repository: https://github.com/smtping/smtping-mcp
- Website: https://smtping.com/email-verification-mcp
- Changelog RSS feed: https://verifymcp.io/servers/smtping-smtping-mcp/smtping-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/smtping-smtping-mcp/smtping-mcp.json
- HTML version of this page: https://verifymcp.io/servers/smtping-smtping-mcp/smtping-mcp