The Automated Case User is used to specify the user we want listed in the case feed items and Case History related list for automated case changes. It can be set either as User or System.
When User is selected, notifications will be sent to the email id of the specified user and that user name will be displayed in the automated case feed changes.
When System is selected, notifications will be sent to the email set in "Email for Automated Case User Notifications" field and System will be displayed as the name in automated case feeds.
In Support Settings, the help text of "Email for Automated Case User Notifications" states that "Email address to which failure messages for the System User are sent", note that these notifications also include Chatter Email Notifications.
For example: When an end user comments on the feed made by "System", an email is sent to the email address in the "Email for Automated Case User Notifications".
To Reproduce:
Similarly, if you specify as user under automated case user, then chatter email notification will be sent to user.
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