MailTester Email Verification MCP Server

by mailtester Your server? Claim it

answering

MailTester Email Verification is answering right now. Last checked 12 min ago. It exposes 9 tools. Last commit 9 Oct 2026.

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

Uptime history 72 hours of history

72 hours agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

266 ms

Response time

average over 24h

Stars

last commit 9 Oct 2026

Nothing serious here today

Today is the operative word: we check MailTester Email Verification every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 12 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add email-verification --transport http https://app.mailtester.com/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

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

~/.codex/config.toml

[mcp_servers.email-verification]
url = "https://app.mailtester.com/mcp"

.cursor/mcp.json

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

.vscode/mcp.json

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

Available tools 9

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

verify

verify_batch

Verify a batch of email addresses (up to 25 per call with an agent key). Returns per-email verdicts and saves a list. Costs 1 credit per email.

verify_email

Verify the deliverability of a single email address. Returns a verdict (valid, invalid, risky, unknown). Costs 1 credit.

api

get_api_key

Get a free API key for this server (no account needed; 25 email verifications per day). Returns the key once — reconnect with 'Authorization: Bearer <api_key>' to use the other tools.

batch

get_batch_status

Get the progress and status of a bulk verification list/job by id.

credit

get_credit_balance

Get the current credit balance and a short usage summary for the account.

estimate

estimate_cost

Estimate the credit cost of a verification before running it, and whether the user can afford it. Provide either a count of emails, a list_id to re-verify, or an operation ('single'/'finder'). Always quote this before proposing anything billable.

explain

explain_result

Explain what a verification status or reason means in plain English, with a send recommendation. Covers valid, invalid, catch-all/accept-all, unknown, greylisted, disposable, role, free, spam-trap, abuse, do-not-mail, no-mx, disabled, and network. Use when a user asks what a result means.

get

get_list

Get the details of a single bulk verification list by its id.

lists

list_lists

List the user's bulk verification lists/jobs, most recent first.

Endpoints

URL	Transport	State	Latency	Checked
https://app.mailtester.com/mcp	streamable-http	answering	453 ms	12 min ago

Alternatives to MailTester Email Verification

same job, measured the same way

Email List Validation Email Verification

by emaillistvalidation

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

9 tools answering

Emaillistchecker.io Email Verification

by emaillistchecker

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

9 tools answering

smails

by pexni

Free disposable email for AI agents: a throwaway inbox to read verification codes over MCP.

48 installs/wk local only

Checkmails — Email Verification

by checkmails

Verify email deliverability by SMTP. Catch-all/disposable/role detection. EU-hosted, GDPR-ready.

answering

Mailsink

by heocoi

Disposable inboxes for AI agents and CI: catch the verification email, read the OTP or link.

30 installs/wk local only

Temp Mail

by temp-mail

Disposable email inboxes for AI agents — read messages and verification codes.

answering

Mailvett: Email Validation API for AI Agents

by cybermax-tools

Mailvett: validate emails. MX, provider, disposable/role/free flags, typo fix, verdict.

1 tools answering

Mailvett: Email Validation API for AI Agents

by workers-cybermax-tools-cybermax

Mailvett: validate emails. MX, provider, disposable/role/free flags, typo fix, verdict.

1 tools answering

MailTester Email Verification — questions

Answers built from our own checks of this server.

What can MailTester Email Verification do?

It exposes 9 tools, read directly from the server on our last check. Among them: estimate_cost, explain_result, get_api_key, get_batch_status, get_credit_balance, get_list and 3 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is MailTester Email Verification working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 266 ms. The bar chart above shows every period we have measured.

How do I connect MailTester Email Verification?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does MailTester Email Verification need an API key?

No. MailTester Email Verification completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 9 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is MailTester Email Verification?

It answers our handshake in 266 ms on average, which is faster than 52% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is MailTester Email Verification open source?

We cannot say either way: 0 stars on GitHub and 1 open issue, but we could not determine the licence, and without one the code is not open source by default.