NOTICE!!!:
Your SMTP/Fax servers must allow browser requests (CORS enabled). Most services require a backend proxy. This app uses mode: 'cors' for safe connections.
SMTP Configuration
Your backend API endpoint for sending emails
Authentication token for your SMTP service
Use CORS mode for proper error handling. No-CORS for restrictive servers (won't show errors)
Fax Configuration
Your fax gateway API endpoint
Authentication token for fax service (e.g., Twilio, eFax API)