![alt text][1]You You can customize the receivers in a limited way.
Task mails must be enabled for potential receivers: either on user level / or globally on the app ( https://developer.axonivy.com/doc/8.0/engine-guide/configuration/email.html#config-email )
... you can exclude a set of users from the list of receivers. Just lead their process path to a normal taskEnd ... instead of showing an endpage. You can decide this easily in an alternative condition....
![alt text][1]
[1]: https://answers.axonivy.com/upfiles/endWithNoMailByCondition.png