Overview SendGrid is Twilio's email delivery engine but uses a completely separate authentication system — SendGrid API keys (starting with ) are not Twilio API keys. You cannot use Account SID/Auth Token for SendGrid, and no Twilio MCP tools wrap SendGrid. --- Quickstart 1. Get your API key from SendGrid Console Settings API Keys 2. Set environment variable: 3. Install SDK: | Language | Install | Package | |----------|---------|---------| | Python | | | | Node.js | | (v8.x) | | Java | Maven | | | C# | | | | Ruby | | | | PHP | | | | Go | | | 4. Authenticate your sending domain (see below) ---…