They have not provided any setting to change the email address than "System Administrator" to send a mail Delivery notification.
However, you can create an event to send a mail from a specific email address to the < from > mail account (recipient of the mail delivery failure) with a notification. Please check if it works for you.
In order to create such events, please follow the steps:
1) Go to the Domains >> Manage Domain
2) Go to the Settings >> Domains Settings >> Events
3) Create a new Event
--> Event Name : Delivery notification
--> Event Category: EMail
--> Event Type: Message Received
--> Subject [Checked] : Equal : Delivery Failure
--> Enable [Checked]
4) Go to the Action Tab
--> Add Action
--> Action : Send Email
--> From Email address: < Enter Your valid Email address i.e. systemadmin@domain.com >
--> To address: #toaddress#
--> Subject: Delivery failure notification received
--> Body: TYPE ANY NOTIFICATION MAIL FOR THE DELIVERY FAILURE NOTIFICATION
That's it!
I have checked it on my server and it works for me:)