Plainmail for Gemini CLI

dev.plainmail/mail

Email on your own domains: add a domain, write its DNS, create mailboxes, read and send mail.

client:Gemini CLI transport:streamable-http

Install Plainmail in Gemini CLI

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

{
  "mcpServers": {
    "mail": {
      "httpUrl": "https://app.plainmail.dev/api/mcp/mcp"
    }
  }
}

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