Anonymous SMTP Authentication Setup

To configure anonymous authentication for SMTP, please make the following changes to your app service environment variables:

Remove These Environment Variables:

These are used for authenticated SMTP and should be removed for anonymous authentication:

• SMTP_USERNAME=""

• SMTP_API_KEY=""

Add or ensure these environment variables are set on the App Service:

Environment Variable	Description
SMTP_HOST	This is the hostname or IP address of your SMTP email server (e.g., mail.contoso.com).
SMTP_PORT	This is the port number that your email server uses for communication. Common ports for SMTP include 25 , 465 (recommended for encrypted communication) or 587.
SMTP_SERVICE	Set this to custom for anonymous authentication setup.
SMTP_REQUIRE_TLS	This variable is to indicate whether TLS is enabled on the server or not. Accepted values include 0 (No) or 1(Yes).
SMTP_TLS_ENABLED	This defines whether the SMTP connection should use TLS. Accepted values include 0 (No) or 1 (Yes).
FROM_EMAIL_ADDRESS	The email address from which emails will be sent. Example: [e-mail].
DKIM_DOMAIN_NAME	(If applicable) Your domain name used for DKIM signing. Example: yourdomain.com.