This was a feature of a ticketing system we replaced with ServiceDesk Plus Cloud, but it had a neat feature I wanted to suggest here.

Our old ticketing system had a list of default notifications that the sys admins configured, but each requester user was given the option to opt out of certain notifications. For example, one of the default notifications emailed the requester when their request was assigned to a technician, but some folks didn't care to receive those so they had the ability to opt out. Other requests, like the receipt confirmation email, could not be opted out of, because we assessed that they were critical notifications that should not be optional.

It was a nice feature for requesters, so I thought I'd suggest it. Thanks!