20.2.1 Setting Up Default From Email Address
Configure the default From address your app uses for native email features.
The native Send E-Mail facilities default the sender in the From
property using the &APP_MAIL. substitution. Configure its value in
the Application Email From Address field on the Properties section of your
app definition.
Tip:
Your APEX instance administrator configures Email server settings for use by all workspaces, so you don't need to configure it yourself.
Parent topic: Sending Emails with Templates