Custom 'From:' address for Report Subscription emails
The ability to enter a customized 'From:' address would allow recipients of the report subscription email to reply to a specified email group that can handle questions and inquiries related to the report or data.
Currently, there is a default address which cannot be changed to my knowledge.
Hunter Blacker commented
Development teams who have a group inbox for support would like to make it easy for end users to ask for support or provide feedback on reports by configuring a custom Reply-To email address.