So,

I have this issue with e-mail notifications.

When an email creates new request, e-mail notifications to technicians is sent.
When an email creates new request, e-mail notifications is sent to a group.
When a request is updated, e-mail notification is sent to a group.

But when a request is closed, e-mail is not sent to a selected technicians or to a requester.

Under the notifications rules, appropriate boxes are checked but ain't working.

How can I fix this problem ?