How do you trigger an email sent when a custom field (Approver) is populated

Question

Couple of questions:

How do you trigger a notification email sent to the email value of the field when a custom field (Approver) is populated?

Granting an email notification has been sent to the email value of the custom field, how can a reply to that email be made part of the comments of the original ticket?

Jobin Kuruvilla [Adaptavist] · Accepted Answer

You can't do it without customization and unfortunately that is not allowed in OnDemand instance.