Email From setting doesnt work with customer notifications

Issue Summary

I am set Email from setting to be without exact name, and be always the same (for example, MCC RU - IT SUPPORT).

Usual notifications JIRA turned off in project. But customer notifications turned on (we like it for easy template editor)

But customer's notifications receiving with fullname of the operator, who make action.

Steps to Reproduce

1. Create a Service Desk project.
2. Go to Admin > System > General Configuration page.
3. Click Edit Settings.
4. In the Email from field, change the option to something else e.g

   {email}, {email.hostname}, (Some Text)
   

Expected Behavior

JIRA Service Desk would use this setting when it sends out notifications to customers.

Actual Behavior

JIRA Service Desk seems to use the username of the person who performed the change whereas JIRA projects respect the change.

Observation

As JIRA Service Desk notification is different from the normal one used by JIRA, could this be because this is hard-coded and this is the expected behavior?