B2B Email & Domain Scorer

B2B Email & Domain Scorer — remote MCP server

For sales and lead-gen teams: get a keep, fix, review or drop decision for every lead email before you send outreach.

1. Connect (free, no key; works in Claude Desktop, Cursor, Cline, VS Code and any client that supports remote Streamable HTTP):

{  "mcpServers": {    "email-scorer": {      "url": "https://email-scorer.mohamed-bahaa53000.workers.dev/demo/mcp"    }  }}

2. Ask: "Is [email protected] OK to email?" Your agent calls:

{"name":"score_email","arguments":{"email":"[email protected]"}}

3. Get (real output from the free demo endpoint, trimmed):

{"action":"fix","send_to":"[email protected]", "action_reason":"Likely typo: send to [email protected] instead", "verdict":"risky","score":10,"reasons":["likely_typo","typo_domain_is_disposable_or_parked"]}

What makes it different

• Decisions, not raw flags: most email validators return 15 booleans and leave your agent to guess. This returns what to do.
• Typos fixed, not just flagged: [email protected] comes back as fix -> [email protected].
• A ready-to-send list: score_batch returns send_list, the deduplicated list of kept plus corrected addresses, and keep/fix/review/drop counts.
• B2B-aware: role inboxes (info@, sales@) and free mailboxes go to review with the reason, because they reach a company but rarely a decision-maker.
• No mail is sent (no SMTP probing that can get your IP blocklisted), and it's MCP-native with a free, keyless demo endpoint.

No-code version

Not building an agent? The same scoring comes in ready-made tools:

• Free email list cleaner checks and cleans up to 25 emails in your browser, with no sign-up.
• Free n8n template: Lead Scoring & Routing scores form leads with Gemini, logs them to Sheets and alerts Slack.

Try it free

• No key, right now: point any MCP client at https://email-scorer.mohamed-bahaa53000.workers.dev/demo/mcp (10 tool calls per IP per day).
• Free RapidAPI plan: 100 requests/month on the Basic plan, no card needed. Pro is $3.99 for 30,000.

This is a hosted (remote) MCP server using Streamable HTTP. There is nothing to install or run locally, and this repository holds documentation and the MCP Registry manifest only. The server code is not open source.

Official MCP Registry name: dev.workers.mohamed-bahaa53000.email-scorer/b2b-email-domain-scorer

Tools

• score_email: action (keep / fix / review / drop), send_to, action_reason, plus verdict (business / free / role / disposable / risky / invalid / unknown), a 0-100 score, reasons, risk, is_disposable / is_free / is_role / accepts_mail flags, MX and mail provider, and a typo suggestion (gmial.com -> gmail.com). deep=true adds SPF/DMARC. No mail is sent.
• score_domain: MX records, mail provider (Google Workspace, Microsoft 365, ...), free/disposable flags, SPF/DMARC for a company domain, URL or email.
• score_batch: clean a list in one call and get send_list plus action counts (paid endpoint only).

Use cases

• Lead-gen and SDR agents: drop disposable and free-mail signups and flag role accounts (info@, sales@) before outreach.
• Fix typo domains in form signups before sending.
• Qualify a company domain: does it receive mail, and on which provider?

Connect

{  "mcpServers": {    "email-scorer": {      "url": "https://email-scorer.mohamed-bahaa53000.workers.dev/demo/mcp"    }  }}

Paid / production (RapidAPI):

{  "mcpServers": {    "email-scorer": {      "url": "https://b2b-email-domain-scorer.p.rapidapi.com/mcp",      "headers": {        "X-RapidAPI-Key": "YOUR_RAPIDAPI_KEY",        "X-RapidAPI-Host": "b2b-email-domain-scorer.p.rapidapi.com"      }    }  }}

For clients that only support stdio: npx -y mcp-remote https://email-scorer.mohamed-bahaa53000.workers.dev/demo/mcp

Notes

• Stateless. Emails aren't stored beyond standard request logs, and the server never sends SMTP probes.
• Scores are heuristics for lead quality, not a deliverability guarantee.