The following step will configure the Postfix server to relay emails from a remote SMTP server with authentication. Postfix SASL Authentication provides a secure way to transfer emails, and it’s easy to set up. It also allows you to customize the authentication process, so if you want to use things like two-factor authentication or IP whitelisting, you can. Overall, Postfix SASL Authentication is a great option for anyone who needs a secure and reliable way to transfer emails. It’s a must-have for anyone who takes security seriously! Save the file and close it.