Chatter Email Notifications for Automated Case User

Understanding the Email for Automated Case User Notifications Field
In Salesforce Support Settings, the help text for "Email for Automated Case User Notifications" states: "Email address to which failure messages for the System User are sent." However, this field also controls where Chatter email notifications are routed.

Example — How Notifications Work When "System" is Selected:
When an end user comments on a feed item that was posted by "System," Salesforce sends an email notification to the email address specified in the "Email for Automated Case User Notifications" field.

Steps to Reproduce this Behavior:

1. In Salesforce Support Settings, set the Automated Case User to System.
2. In the "Email for Automated Case User Notifications" field, enter the email address to which notification emails should be sent.
3. Send a case email to the Email-to-Case address so that the system automatically creates a case.
4. Comment on the created case under the inbound email feed item.
5. Observe that a Chatter notification email is sent to the email address configured in the "Email for Automated Case User Notifications" field.

Similarly, if the Automated Case User is set to User, Chatter email notifications are sent to that specified user's email address.

Key Takeaway: The "Email for Automated Case User Notifications" field controls more than just failure messages — it also routes Chatter email notifications for any feed activity associated with the System user.