MailTester Ninja for Gemini CLI

ninja.mailtester/email-verification

Verify email addresses live against their mail server and find work emails. Nothing stored.

client:Gemini CLI transport:streamable-http tools:2

Install MailTester Ninja in Gemini CLI

~/.gemini/settings.json · windows: %USERPROFILE%\.gemini\settings.json

{
  "mcpServers": {
    "email-verification": {
      "httpUrl": "https://mcp.mailtester.ninja/mcp"
    }
  }
}

Gemini expands $VAR and ${VAR} inside env values, so a secret can live in your shell rather than this file. Gemini CLI docs