What is the key difference between Mail7 Email Validation and Winnr?

Mail7 Email Validation belongs to the Communication category with local stdio execution, while Winnr belongs to the Communication category with local stdio execution.

How do I install Mail7 Email Validation or Winnr in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are Mail7 Email Validation and Winnr free or paid?

Mail7 Email Validation operates under a Free / Open Source model (No auth required). Winnr operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

Mail7 Email Validation lists 4 tools with 2 views and 0 GitHub stars. Winnr lists 54 tools with 0 views and 0 GitHub stars.

Can I use both Mail7 Email Validation and Winnr together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

Side-by-Side Model Context Protocol Comparison

Mail7 Email Validation vs Winnr

In-depth architectural comparison of the Mail7 Email Validation and Winnr MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

At a Glance & Executive Verdict

Mail7 Email Validation

Communication · Local stdio

Quality: 56/100 (Good) | Auth: No auth required

Winnr

Communication · Local stdio

Quality: 52/100 (Good) | Auth: No auth required

Verdict Summary: Choose Mail7 Email Validation if you need specialized Communication tools running via a local process. Choose Winnr if your workspace requires Communication integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Mail7 Email Validation when:

You need dedicated capabilities in the Communication domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
You have access to required keys: MAIL7_API_KEY, MAIL7_BASE_URL.
Primary tools included: validate_email, validate_emails, check_domain.

Explore Mail7 Email Validation Details

Choose Winnr when:

You need dedicated capabilities in the Communication domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
You have access to required keys: WINNR_API_TOKEN.
Primary tools included: winnr_get_account, winnr_get_usage, winnr_list_jobs.

Feature & Specification Comparison

Specification	Mail7 Email Validation Communication	W Winnr Communication
Summary
Category & Scope	Communication	Communication
Quality signal

Tools & Capabilities Breakdown

Mail7 Email Validation Tools (4)

validate_email

Check whether a single email address is deliverable: syntax, domain MX records, disposable-domain database and a live SMTP mailbox probe. Status is one of "Valid", "Not Valid", "Unknown". Unknown means the mailbox could NOT be checked (catch-all domain, greylisting, blocked SMTP port) - it is NOT a bad address. Never delete, reject or report Unknown addresses as invalid; present them separately and let the user decide. Use validate_emails instead when you have more than one address.

validate_emails

Check up to 50 email addresses in one call and get a per-address verdict plus a summary. Status is one of "Valid", "Not Valid", "Unknown". Unknown means the mailbox could NOT be checked (catch-all domain, greylisting, blocked SMTP port) - it is NOT a bad address. Never delete, reject or report Unknown addresses as invalid; present them separately and let the user decide. Requires MAIL7_API_KEY (anonymous callers get a 25-address free sample only). Each address takes a few seconds of real SMTP work, so this call is slow by nature: for a longer list, split it and call this tool repeatedly with the next 50 addresses. Never run two calls in parallel - the API serialises one bulk job per client and the second call fails.

check_domain

Audit a domain's email setup in one call: MX records, SPF, DKIM, DMARC, MTA-STS, TLS-RPT, DNSSEC and BIMI, graded A-F with a fix for every problem found. Use this to answer "can this domain send and receive mail" or "why do our messages land in spam". Takes a domain (example.com), not an email address. The default answer summarises every section; pass `section` to get the full records and findings of one of them.

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

Mail7 Email Validation Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "mail7-email-validation": {
      "command": "npx",
      "args": [
        "-y",
        "mail7-mcp"
      ],
      "env": {
        "MAIL7_API_KEY": "YOUR_MAIL7_API_KEY_HERE",
        "MAIL7_BASE_URL": "YOUR_MAIL7_BASE_URL_HERE"
      }
    }
  }
}

Winnr Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "winnr": {
      "command": "uvx",
      "args": [
        "winnr-mcp"
      ],
      "env": {
        "WINNR_API_TOKEN": "YOUR_WINNR_API_TOKEN_HERE"
      }
    }
  }
}

Frequently Asked Questions

Mail7 Email Validation is categorized under Communication and uses a local stdio subprocess. In contrast, Winnr belongs to Communication using local stdio subprocess. Select Mail7 Email Validation when you need capabilities focused on communication and Winnr when you require tools for communication.

More alternatives to Mail7 Email Validation More alternatives to Winnr Communication category hub