MailTester Email Verification

com.mailtesterv1.0.1更新於 Oct 9, 2026

Verify emails (valid/invalid/risky/unknown): MX, SMTP, catch-all, disposable. Free agent key.

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概覽

AI 產生的概覽

讓助理檢查某個電子郵件地址能否收信，回傳有效、無效、有風險或未知的判定結果。

功能
這是一個託管式的電子郵件驗證 MCP 伺服器。工具包含 verify_email（驗證單一地址）、verify_batch（每次最多 25 個地址）、get_api_key（取得免費金鑰）、explain_result（用白話解釋判定並給出是否寄送的建議），以及 estimate_cost、get_credit_balance、get_batch_status、list_lists 和 get_list（用於額度與已儲存清單）。判定涵蓋 MX、SMTP、全接收、角色地址與一次性信箱等檢查。
適用情境
適合在寄信或接受註冊之前使用，讓助理確認地址可投遞而不是靠猜測。也適合批次清理地址清單，以及解釋某個地址為何被標記。
執行需求
遠端託管端點，無需安裝。需要金鑰，透過 Authorization 標頭以 Bearer 形式送出；可用 get_api_key 工具或註冊端點取得，不需要帳號。需要能連線至該服務商網路。
安裝前請注意
Authorization 標頭攜帶金鑰，屬於敏感憑證；金鑰只顯示一次，30 天後過期，免費金鑰每天 25 次驗證，且有共享的每日容量與速率限制。驗證會把送出的地址傳給第三方服務，應視為資料離開本機環境。批次呼叫會依地址數量消耗額度。

安裝

在 SourceWeft 中

  1. 開啟 儀表板中的 MailTester Email Verification，將其新增到工作區。
  2. 為需要使用其工具的對話啟用該服務。

Web executable，透過 Streamable HTTP。 遠端服務在工作區中設定後即可從網頁執行環境執行。

其他 MCP 客戶端

把它新增到你客戶端的 mcpServers 設定中。

{
  "mcpServers": {
    "email-verification": {
      "type": "http",
      "url": "https://app.mailtester.com/mcp"
    }
  }
}

README

MailTester MCP server — email verification for AI agents

Remote Model Context Protocol server that tells an AI agent whether an email address can receive mail before anything is sent to it.

The server is hosted; there is nothing to install. This repository documents how to connect.

Get a key (no account needed)

Connect without a key and call the get_api_key tool, or:

bash
curl -X POST https://app.mailtester.com/agent-gateway/register \  -H 'Content-Type: application/json' \  -d '{"name":"my-agent","purpose":"verify signup emails"}'

The key is shown once. Each key gets 25 free verifications per day (unused credits do not roll over) and expires after 30 days; register again when it does. Send it as Authorization: Bearer <api_key>.

Connect

Claude Code

bash
claude mcp add --transport http mailtester https://app.mailtester.com/mcp --header "Authorization: Bearer YOUR_KEY"

Claude Desktop / Cursor / VS Code (mcp.json-style config)

json
{  "mcpServers": {    "mailtester": {      "type": "http",      "url": "https://app.mailtester.com/mcp",      "headers": { "Authorization": "Bearer YOUR_KEY" }    }  }}

Tools

ToolWhat it does
get_api_keyGet a free key (works without a key)
verify_emailVerify one address → valid, invalid, risky or unknown (1 credit)
verify_batchVerify up to 25 addresses per call, with per-address verdicts
get_batch_status, list_lists, get_listFollow saved verification lists
explain_resultExplain a verdict in plain English, with a send recommendation
estimate_cost, get_credit_balanceCheck credits before running

Verdicts

  • valid: the mailbox exists and accepts mail
  • invalid: the address or domain cannot receive mail
  • risky: accept-all (catch-all) domain, role or disposable address, or a Microsoft 365 address the mail server couldn't confirm
  • unknown: the receiving server gave no definitive answer

Limits

10 requests per minute per key, one request in flight per key, and a shared daily capacity for free agent keys (HTTP 429 until 00:00 UTC when it is used up). Inbox placement, blacklist monitoring and email finder need a full account at https://mailtester.com.

REST API

The same key works on the REST API: POST https://app.mailtester.com/api/v1/verify, POST https://app.mailtester.com/api/v1/verify/batch, GET https://app.mailtester.com/api/v1/credits. See the OpenAPI description.

來源：README.md，提交 3bc86f2

工具

0
工具後設資料尚未被收錄。

版本歷史

1
  1. v1.0.1最新Oct 9, 2026