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MCP server that sends mail over SMTP, gated behind an allowlist and a human confirmation
SMTP 是 ChatHome Skills 收录的 MCP 条目，来源为 Official MCP Registry，质量分 73/100。 作为 Model Context Protocol 服务器，它向 Claude、Cursor、Copilot 等兼容 MCP 的 LLM 客户端暴露可直接调用的工具，让 agent 的能力超出模型内置范围。 该条目由 ChatHome Skills 的每日抓取从官方 registry 和 GitHub 发现查询中收录，每次运行都会重新核验仓库事实、新鲜度信号和安装元数据。 质量分综合了官方 registry 收录情况、可用安装命令、许可证完整性、仓库活跃度和 GitHub star 趋势，完整算法说明见来源页。安装命令已列于上方，可直接复制使用。 在将 SMTP 加入生产 agent 工作流前，请核对上方的最近更新日期和仓库状态——下方事实快照是最近一次抓取的时点值。
npx -y @ni-c/smtp-mcp@0.2.0运行此命令前，请先核对上游源码。
{
"_meta": {
"io.modelcontextprotocol.registry/official": {
"status": "active",
"isLatest": true,
"updatedAt": "2026-09-07T18:06:20.626217Z",
"publishedAt": "2026-09-07T18:06:20.626217Z",
"statusChangedAt": "2026-09-07T18:06:20.626217Z"
}
},
"server": {
"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 <person@example.net>\". There is no from parameter."
},
{
"name": "SMTP_REPLY_TO",
"format": "string",
"description": "Reply-To header on every message, e.g. \"Team <team@example.net>\". 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 <person@example.net>\". There is no from parameter."
},
{
"name": "SMTP_REPLY_TO",
"format": "string",
"description": "Reply-To header on every message, e.g. \"Team <team@example.net>\". 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"
}
}