In Email Preferences, you can select the email vendor and configure the Email Category Opt-In settings.
Configuring Email Preferences:
Go to Setup → Emails → Preferences
Default Email Vendor Section:
Select the Default Email Vendor from the dropdown menu.
Category Opt-In Required Section:
Manage Opt-In requirements for different email categories, ensuring compliance and accurate categorization.
Locate the Category Opt-in Required section
By default, Invitation email does not require Opt-In
Make the desired changes based on your requirements
Apply
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For more information on Email Categories, refer to Understanding Email Categories.