Mail7 Email Validation

Name: Mail7 Email Validation
Author: dvlop

by dvlopversion 0.1.1i★ –iRuns on your computer

Registry namenet.mail7/email-validation

Install

Overview

Description from the maker (original English)

Verify email addresses, clean lists, and audit a domain SPF, DKIM, DMARC and MX setup.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Chat & email
You need to fill in: MAIL7_API_KEY

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: MAIL7_API_KEY, MAIL7_BASE_URL

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "email-validation": {
      "command": "npx",
      "args": [
        "-y",
        "mail7-mcp"
      ],
      "env": {
        "MAIL7_API_KEY": "your-value",
        "MAIL7_BASE_URL": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add email-validation --env MAIL7_API_KEY=your-value --env MAIL7_BASE_URL=your-value -- npx -y mail7-mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "email-validation": {
      "command": "npx",
      "args": [
        "-y",
        "mail7-mcp"
      ],
      "env": {
        "MAIL7_API_KEY": "your-value",
        "MAIL7_BASE_URL": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "email-validation": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "mail7-mcp"
      ],
      "env": {
        "MAIL7_API_KEY": "your-value",
        "MAIL7_BASE_URL": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

MAIL7_API_KEY secret env
Mail7 API key. Optional, but anonymous callers are limited to 5 checks per minute and a 25-address bulk sample. Get one at https://mail7.net/account/
MAIL7_BASE_URL env
Override the API endpoint. Defaults to https://mail7.net/api

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain mail7.net (the registry checks domain ownership)
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Chat & emaili

More stars than 0% of the other 1763 servers in this category
Published to the registry more recently than 23% of the other 1763 servers in this category
Basic checks equal to or better than 100% of the other 1763 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Mail7 Email Validation safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: MAIL7_API_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.1) reached the registry 3 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Vexa, emailmd, MCP WhatsApp Cloud

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Vexa

by Vexa-ai

Meeting bot and transcripts for Google Meet, Teams and Zoom. Live or after, speakers labelled.

Runs in the cloud★ 2,949Apache-2.0Updated 2 months ago

Install

emailmd

by anypost

Render markdown into email-safe HTML, lint drafts for deliverability problems, and preview emails.

Computer or cloud★ 1,385MITUpdated 31 days ago

Install

MCP WhatsApp Cloud

by codespar

MCP server for WhatsApp Cloud API (Meta) — messages, media, and templates via Graph API

Runs on your computer★ 277MITUpdated 5 months ago

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Mail7 MCP server

Email validation for AI assistants. This is an MCP server that gives Claude, Cursor, Windsurf, Cline and any other MCP client four tools: verify a single address, clean a list, check a domain's SPF record, and audit a domain's whole mail configuration.

Honest by design: Mail7 answers Valid, Not Valid or Unknown, and the tool descriptions tell the model in plain words that Unknown means "could not be verified", not "bad". An assistant using this server will not silently delete addresses it could not check.

Install

Node 18+ required. No install step - the server runs through npx.

Claude Code

claude mcp add mail7 --env MAIL7_API_KEY=your_key -- npx -y mail7-mcp

Claude Desktop (claude_desktop_config.json), Cursor (~/.cursor/mcp.json), and most other clients use the same shape:

"mcpServers": { "mail7": { "command": "npx", "args": ["-y", "mail7-mcp"], "env": { "MAIL7_API_KEY": "your_key" } } } }

Get an API key at mail7.net/account. The server also runs without one, but anonymous callers are limited to 5 checks per minute and a 25-address free bulk sample - not enough for real work.

Variable	Default	Purpose
`MAIL7_API_KEY`	-	Raises rate limits, unlocks full bulk validation
`MAIL7_BASE_URL`	`https://mail7.net/api`	Override the API endpoint

Tools

Tool	What it does
`validate_email`	One address: syntax, MX, disposable-domain check, live SMTP mailbox probe
`validate_emails`	Up to 50 addresses per call, with a Valid / Not Valid / Unknown summary
`check_domain`	Full mail-config audit graded A-F: MX, SPF, DKIM, DMARC, MTA-STS, TLS-RPT, DNSSEC, BIMI
`check_spf`	SPF record, mechanisms, lookup count and misconfigurations

Ask your assistant things like:

"Is sales@acme.com a real mailbox?"
"Clean this list of signups and tell me which ones bounce."
"Why do our emails to customers land in spam? Check ourdomain.com."

How results are shaped

validate_email and validate_emails return structured content alongside the text, so a client that supports structured tool output gets typed fields:

"email": "user@example.com", "status": "Unknown", // "Valid" | "Not Valid" | "Unknown" "valid": null, // true | false | null (null = Unknown) "formatValid": true, "mxValid": true, "smtpValid": false, "is_disposable": false, "details": "Server accepts all addresses (catch-all) - status unknown" }

check_domain returns a compact graded summary with a fix for every problem. To see the raw records of one part, call it again with section set to mx, spf, dkim, dmarc, mta_sts, tls_rpt, dnssec, bimi or domain.

Notes for large lists

Every address is a live SMTP conversation, so a check takes seconds, not milliseconds. validate_emails caps at 50 addresses per call on purpose - call it repeatedly with the next chunk rather than pushing a whole file through one call, and never run two calls in parallel (the API serialises one bulk job per client).

Development

npm install

npm run build # -> dist/ node dist/index.js # speaks MCP over stdio

License

MIT. Part of the Mail7 integrations.

Mail7 Email Validation

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Chat & emaili

Common questions

Alternatives

Vexa

emailmd

MCP WhatsApp Cloud

README from the maker

Mail7 MCP server

Install

Tools

How results are shaped

Notes for large lists

Development

License