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mcp/harbor
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MailTester Email Verification MCP

v1.0.0

com.mailtester/email-verification

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

transport:streamable-http tools:9
Website

Target client

run in your project directory 

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

setup guides: Claude Code Claude Desktop Cursor VS Code Zed Windsurf Cline Gemini CLI Grok ChatGPT Claude.ai LangChain

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs

get_api_key Read-only

get api key

get_credit_balance Read-only

get credit balance

list_lists Read-only

list lists

get_list Read-only

get list

explain_result

explain result

verify_email

verify email

verify_batch

verify batch

estimate_cost

estimate cost

get_batch_status Read-only

get batch status

All 9 tools, one page each

Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. Check the server's own documentation before granting access.