Supabase Auth allows users to send emails, but these emails are typically sent from `[email protected]`, which may not be suitable for production use. To improve deliverability and brand recognition, it's recommended to set up a custom SMTP server. Supabase has made it easy to configure such a server, with an integration available with Resend that allows users to connect their project and send emails from their own domain. This setup provides full control and visibility over email delivery, enabling users to see if emails were sent, delivered, bounced, or marked as spam. Users can also manually configure their SMTP server by navigating to Project Settings and Auth, where they can input the necessary settings, such as host, port number, username, password, sender email, and sender name.