ContactLint MCP Server
Validate emails and phone numbers before your agent saves them.
ContactLint is a Developer Tools MCP (Model Context Protocol) server: Validate emails and phone numbers before your agent saves them. It is MIT-licensed and available as a hosted endpoint, so it works with no local install. It exposes 3 tools including validate_email, validate_emails, validate_phone. Listed on MCP Collection since October 2026.
About ContactLint
Hosted MCP and HTTP API. Tools: validate_email, validate_emails (up to 50), validate_phone. Checks syntax, MX/A via DoH, disposable domains, role addresses, typo suggestions (did_you_mean), and phone parse with libphonenumber. Does not confirm mailbox existence or catch-all. Auth: Authorization Bearer API key. initialize and tools/list need no key. 100 free checks/month; packs from $9/5k. DNS-failure unknowns are not billed. Endpoint https://contactlint.com/mcp
ContactLint tools (3)
Read from the live server on Oct 26, 2026. These are the tools your AI assistant can call once connected.
validate_email- Check an email address: syntax, MX/A records via DNS-over-HTTPS, disposable domain, role address, free provider, typo suggestion for major providers. No SMTP probing. Uses 1 check.
validate_emails- Check a list of up to 50 email addresses in one call, with the same checks as validate_email. Returns one result per address in the same order plus a summary of verdicts. Uses 1 check per address; addresses whose DNS lookup fails come back
validate_phone- Parse and validate a phone number: valid, possible, type, region, E.164 and national formats. Uses 1 check.
How to connect ContactLint to Claude, Cursor or VS Code
ContactLint runs as a hosted remote MCP server at https://contactlint.com/mcp. Add that URL to your MCP client's config (Claude Code, Cursor, Windsurf or VS Code) and the tools appear immediately, no install required.
{
"mcpServers": {
"contactlint": {
"url": "https://contactlint.com/mcp"
}
}
}Claude Code: claude mcp add --transport http contactlint https://contactlint.com/mcp. Servers that require OAuth or an API key will prompt on first use.
ContactLint FAQ
What is ContactLint?
ContactLint is a Model Context Protocol (MCP) server in the Developer Tools category. Validate emails and phone numbers before your agent saves them. MCP servers expose tools that AI assistants like Claude can call during a conversation.
How do I use ContactLint with Claude or Cursor?
ContactLint runs as a hosted remote MCP server at https://contactlint.com/mcp. Add that URL to your MCP client's config (Claude Code, Cursor, Windsurf or VS Code) and the tools appear immediately, no install required.
Is ContactLint free to use?
ContactLint is published under the MIT license, so the software itself is free to run. Hosted or API-backed servers may have their own usage tiers; check the project homepage.
What tools does ContactLint provide?
ContactLint exposes 3 MCP tools: validate_email, validate_emails, validate_phone. This list is read from the live server (last verified Oct 26, 2026).
Is the ContactLint MCP server online?
Yes. MCP Collection checks the endpoint every day; it last answered on Oct 26, 2026.
Where is the source code for ContactLint?
The source is at github.com/zksyncer/contactlint.