Connect

8 clients · secrets stay placeholders

JSON (mcpServers)Claude CodeCodexOpenCodeCursorVS CodeGemini CLIGoose

{
  "mcpServers": {
    "smtp-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@ni-c/[email protected]"
      ],
      "env": {
        "SMTP_HOST": "${SMTP_HOST}",
        "SMTP_USER": "${SMTP_USER}",
        "SMTP_PASSWORD": "${SMTP_PASSWORD}",
        "SMTP_FROM": "${SMTP_FROM}"
      }
    }
  }
}

claude mcp add smtp-mcp -e "SMTP_HOST=${SMTP_HOST}" -e "SMTP_USER=${SMTP_USER}" -e "SMTP_PASSWORD=${SMTP_PASSWORD}" -e "SMTP_FROM=${SMTP_FROM}" -- npx -y @ni-c/[email protected]

[mcp_servers.smtp-mcp]
command = "npx"
args = ["-y", "@ni-c/[email protected]"]
env = { "SMTP_HOST" = "${SMTP_HOST}", "SMTP_USER" = "${SMTP_USER}", "SMTP_PASSWORD" = "${SMTP_PASSWORD}", "SMTP_FROM" = "${SMTP_FROM}" }

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "smtp-mcp": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@ni-c/[email protected]"
      ],
      "enabled": true,
      "environment": {
        "SMTP_HOST": "{env:SMTP_HOST}",
        "SMTP_USER": "{env:SMTP_USER}",
        "SMTP_PASSWORD": "{env:SMTP_PASSWORD}",
        "SMTP_FROM": "{env:SMTP_FROM}"
      }
    }
  }
}

{
  "mcpServers": {
    "smtp-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@ni-c/[email protected]"
      ],
      "env": {
        "SMTP_HOST": "${SMTP_HOST}",
        "SMTP_USER": "${SMTP_USER}",
        "SMTP_PASSWORD": "${SMTP_PASSWORD}",
        "SMTP_FROM": "${SMTP_FROM}"
      }
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=smtp-mcp&config=eyJjb21tYW5kIjoibnB4IiwiYXJncyI6WyIteSIsIkBuaS1jL3NtdHAtbWNwQDAuMi4wIl0sImVudiI6eyJTTVRQX0hPU1QiOiIke1NNVFBfSE9TVH0iLCJTTVRQX1VTRVIiOiIke1NNVFBfVVNFUn0iLCJTTVRQX1BBU1NXT1JEIjoiJHtTTVRQX1BBU1NXT1JEfSIsIlNNVFBfRlJPTSI6IiR7U01UUF9GUk9NfSJ9fQ%3D%3D"
}

{
  "servers": {
    "smtp-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@ni-c/[email protected]"
      ],
      "env": {
        "SMTP_HOST": "${SMTP_HOST}",
        "SMTP_USER": "${SMTP_USER}",
        "SMTP_PASSWORD": "${SMTP_PASSWORD}",
        "SMTP_FROM": "${SMTP_FROM}"
      }
    }
  }
}

{
  "mcpServers": {
    "smtp-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@ni-c/[email protected]"
      ],
      "env": {
        "SMTP_HOST": "${SMTP_HOST}",
        "SMTP_USER": "${SMTP_USER}",
        "SMTP_PASSWORD": "${SMTP_PASSWORD}",
        "SMTP_FROM": "${SMTP_FROM}"
      }
    }
  }
}

extensions:
  "smtp-mcp":
    enabled: true
    name: "smtp-mcp"
    type: stdio
    cmd: "npx"
    args:
      - "-y"
      - "@ni-c/[email protected]"
    envs:
      "SMTP_HOST": "${SMTP_HOST}"
      "SMTP_USER": "${SMTP_USER}"
      "SMTP_PASSWORD": "${SMTP_PASSWORD}"
      "SMTP_FROM": "${SMTP_FROM}"
    timeout: 300

Placeholders to fill from your own secret store: ${SMTP_PASSWORD}. The registry never accepts secret values.

This is a local package: the command runs on your machine.

Quality – / 100not scored

Not scored: fewer than three checks apply, usually because no remote answered a credential-free probe or the server is a local package.

protocoln/a · weight 25

n/a
protocol.modern, protocol.stateless, protocol.transport, protocol.list_ttlno remote answered a protocol handshake (not probed yet, unreachable, or local-only)

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygienen/a · weight 30

n/a
tools.descriptions, tools.description_length, tools.schemas, tools.annotations, tools.directory_hints, tools.token_cost, tools.api_dumptool list unknown (behind auth, not probed, or empty)

stabilityn/a · weight 15

n/a
stability.changes, stability.rug_pulltool list unknown

dependencies67 · weight 15

fail
deps.known_vulns2 advisories to act on (malicious, or rated high or critical with a fix available): GHSA-prgh-xp8r-p3m5 in [email protected] (direct, fixed in 10.0.5), GHSA-v53p-9fqp-m79j in [email protected] (direct, fixed in 10.0.6); 3 more of lower severity or without a fix
pass
deps.mcp_sdk_version@modelcontextprotocol/server 2.1.0, no known advisory
pass
deps.resolvable@ni-c/[email protected] resolved: 8 packages

Tool list unknown · checked 2026-10-20 12:13 UTC

Tool changes

No tool definition changes recorded. A server's first observation is its baseline; later probes record what changes.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 90 / 100

provenance90

livenessn/a

freshness85

hygiene95

+repository +namespace-matches-repo +website ~liveness-unmeasured ~updated-43d-ago -unpinned-packages(1)

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Dependencies

@ni-c/[email protected] npm7 dependencies, resolved · MCP SDK @modelcontextprotocol/server 2.1.0 · advisories checked 2026-10-19

advisory	severity	package	fixed in
GHSA-prgh-xp8r-p3m5Nodemailer addressparser: O(n^2) on comment-joined addresses enables a remote DoS (reachable via mailparser)	high	`[email protected]`direct	fixed in `10.0.5`
GHSA-v53p-9fqp-m79jNodemailer: Quadratic backtracking in the addressparser free-text fallback allows remote denial of service	high	`[email protected]`direct	fixed in `10.0.6`
GHSA-6vj9-mwq6-2f5vNodemailer: Process-global DNS cache reuses TLS `servername` across transports, enabling cross-tenant SMTP credential disclosure	moderate	`[email protected]`direct	fixed in `10.0.2`
GHSA-8vvx-rff5-p5rqNodemailer: Nested structured recipient arrays bypass the parser depth limit and cause stack exhaustion DoS	moderate	`[email protected]`direct	fixed in `10.0.2`
GHSA-g57g-f23g-4646Nodemailer: Quoted local-part can produce malformed envelope recipient through RFC 5322 comment parsing	moderate	`[email protected]`direct	fixed in `10.0.9`

Dependency graphs from deps.dev; advisories from OSV.dev, including the GitHub Advisory Database and the PyPI Advisory Database; all CC BY 4.0. The graph is what a clean install of this version resolves today; nothing was installed or run. How it is checked.

Endpoints

package	registry	version	runtime	secrets
`@ni-c/smtp-mcp`	npm	0.2.0	–	`SMTP_PASSWORD`
`ghcr.io/ni-c/smtp-mcp:0.2.0`	oci	unpinned	–	`SMTP_PASSWORD`

Tools (0)

No tools observed. Local packages are never executed by the registry.

Schemas: list_tools.

Similar MCP servers

More from io.github.ni-c

And 13 more from this publisher.

Official server.json

{
  "name": "io.github.ni-c/smtp-mcp",
  "title": "SMTP",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "version": "0.2.0",
  "packages": [
    {
      "version": "0.2.0",
      "transport": {
        "type": "stdio"
      },
      "identifier": "@ni-c/smtp-mcp",
      "registryType": "npm",
      "environmentVariables": [
        {
          "name": "SMTP_HOST",
          "format": "string",
          "isRequired": true,
          "description": "Hostname of the SMTP server, e.g. smtp.example.net."
        },
        {
          "name": "SMTP_PORT",
          "format": "number",
          "description": "Port. Defaults to 587 for starttls, 465 for implicit, 25 for none."
        },
        {
          "name": "SMTP_TLS",
          "format": "string",
          "description": "starttls (default), implicit or none. STARTTLS is required, never opportunistic."
        },
        {
          "name": "SMTP_USER",
          "format": "string",
          "isRequired": true,
          "description": "Username for SMTP authentication."
        },
        {
          "name": "SMTP_PASSWORD",
          "format": "string",
          "isSecret": true,
          "isRequired": true,
          "description": "Password or app-specific password for SMTP authentication."
        },
        {
          "name": "SMTP_FROM",
          "format": "string",
          "isRequired": true,
          "description": "The only sender this server will use, e.g. \"Name <[email protected]>\". There is no from parameter."
        },
        {
          "name": "SMTP_REPLY_TO",
          "format": "string",
          "description": "Reply-To header on every message, e.g. \"Team <[email protected]>\". Unset means no Reply-To header and replies go to SMTP_FROM. There is no reply_to parameter."
        },
        {
          "name": "SMTP_ALLOW_SEND",
          "format": "boolean",
          "description": "Set to \"true\" to register the sending tools. Defaults to false: the server cannot send until it is set."
        },
        {
          "name": "SMTP_ALLOWED_RECIPIENTS",
          "format": "string",
          "description": "Comma-separated addresses and @domains this server may write to. Required with SMTP_ALLOW_SEND=true; \"*\" allows any."
        },
        {
          "name": "SMTP_MAX_RECIPIENTS",
          "format": "number",
          "description": "Maximum distinct recipients across To, Cc and Bcc in one message. Default 10."
        },
        {
          "name": "SMTP_MAX_SENDS_PER_HOUR",
          "format": "number",
          "description": "Sliding hourly cap on messages sent. Default 20."
        },
        {
          "name": "SMTP_MAX_MESSAGE_BYTES",
          "format": "number",
          "description": "Maximum size of the composed message. Default 10485760."
        },
        {
          "name": "SMTP_MAX_ATTACHMENT_BYTES",
          "format": "number",
          "description": "Maximum size of a single attachment. Default 5242880."
        },
        {
          "name": "SMTP_ATTACHMENT_DIR",
          "format": "string",
          "description": "Directory attachments are read from. Unset means attachments are unavailable."
        },
        {
          "name": "SMTP_ATTACHMENT_TYPES",
          "format": "string",
          "description": "Comma-separated content types that may be attached. Defaults to a document and image allowlist."
        },
        {
          "name": "SMTP_SIGNATURE",
          "format": "string",
          "description": "Text appended below the standard signature delimiter of every message."
        },
        {
          "name": "SMTP_AUDIT_LOG",
          "format": "string",
          "description": "File the audit lines are appended to, in addition to stderr."
        },
        {
          "name": "SMTP_ALLOW_TOOLS",
          "format": "string",
          "description": "Comma-separated tool names, a prefix with one trailing *, or \"essential\" for the curated preset."
        },
        {
          "name": "SMTP_DENY_TOOLS",
          "format": "string",
          "description": "Comma-separated tool names or prefixes to remove, applied after SMTP_ALLOW_TOOLS."
        },
        {
          "name": "SMTP_INSECURE_TLS",
          "format": "boolean",
          "description": "Set to \"true\" to accept self-signed certificates. Prefer a proper internal CA."
        }
      ]
    },
    {
      "transport": {
        "type": "stdio"
      },
      "identifier": "ghcr.io/ni-c/smtp-mcp:0.2.0",
      "registryType": "oci",
      "environmentVariables": [
        {
          "name": "SMTP_HOST",
          "format": "string",
          "isRequired": true,
          "description": "Hostname of the SMTP server, e.g. smtp.example.net."
        },
        {
          "name": "SMTP_PORT",
          "format": "number",
          "description": "Port. Defaults to 587 for starttls, 465 for implicit, 25 for none."
        },
        {
          "name": "SMTP_TLS",
          "format": "string",
          "description": "starttls (default), implicit or none. STARTTLS is required, never opportunistic."
        },
        {
          "name": "SMTP_USER",
          "format": "string",
          "isRequired": true,
          "description": "Username for SMTP authentication."
        },
        {
          "name": "SMTP_PASSWORD",
          "format": "string",
          "isSecret": true,
          "isRequired": true,
          "description": "Password or app-specific password for SMTP authentication."
        },
        {
          "name": "SMTP_FROM",
          "format": "string",
          "isRequired": true,
          "description": "The only sender this server will use, e.g. \"Name <[email protected]>\". There is no from parameter."
        },
        {
          "name": "SMTP_REPLY_TO",
          "format": "string",
          "description": "Reply-To header on every message, e.g. \"Team <[email protected]>\". Unset means no Reply-To header and replies go to SMTP_FROM. There is no reply_to parameter."
        },
        {
          "name": "SMTP_ALLOW_SEND",
          "format": "boolean",
          "description": "Set to \"true\" to register the sending tools. Defaults to false: the server cannot send until it is set."
        },
        {
          "name": "SMTP_ALLOWED_RECIPIENTS",
          "format": "string",
          "description": "Comma-separated addresses and @domains this server may write to. Required with SMTP_ALLOW_SEND=true; \"*\" allows any."
        },
        {
          "name": "SMTP_MAX_RECIPIENTS",
          "format": "number",
          "description": "Maximum distinct recipients across To, Cc and Bcc in one message. Default 10."
        },
        {
          "name": "SMTP_MAX_SENDS_PER_HOUR",
          "format": "number",
          "description": "Sliding hourly cap on messages sent. Default 20."
        },
        {
          "name": "SMTP_MAX_MESSAGE_BYTES",
          "format": "number",
          "description": "Maximum size of the composed message. Default 10485760."
        },
        {
          "name": "SMTP_MAX_ATTACHMENT_BYTES",
          "format": "number",
          "description": "Maximum size of a single attachment. Default 5242880."
        },
        {
          "name": "SMTP_ATTACHMENT_DIR",
          "format": "string",
          "description": "Directory attachments are read from. Unset means attachments are unavailable."
        },
        {
          "name": "SMTP_ATTACHMENT_TYPES",
          "format": "string",
          "description": "Comma-separated content types that may be attached. Defaults to a document and image allowlist."
        },
        {
          "name": "SMTP_SIGNATURE",
          "format": "string",
          "description": "Text appended below the standard signature delimiter of every message."
        },
        {
          "name": "SMTP_AUDIT_LOG",
          "format": "string",
          "description": "File the audit lines are appended to, in addition to stderr."
        },
        {
          "name": "SMTP_ALLOW_TOOLS",
          "format": "string",
          "description": "Comma-separated tool names, a prefix with one trailing *, or \"essential\" for the curated preset."
        },
        {
          "name": "SMTP_DENY_TOOLS",
          "format": "string",
          "description": "Comma-separated tool names or prefixes to remove, applied after SMTP_ALLOW_TOOLS."
        },
        {
          "name": "SMTP_INSECURE_TLS",
          "format": "boolean",
          "description": "Set to \"true\" to accept self-signed certificates. Prefer a proper internal CA."
        }
      ]
    }
  ],
  "repository": {
    "url": "https://github.com/ni-c/smtp-mcp",
    "source": "github"
  },
  "websiteUrl": "https://smtp-mcp.ni-c.de",
  "description": "MCP server that sends mail over SMTP, gated behind an allowlist and a human confirmation"
}