Technician Notification Emails

Does anyone else have issues with new request email notifications being sent to technicians? Emails are sent when a request is assigned, appended with an update or closed as normal. It is only affecting emails for new request notifications.

I have double checked email server settings (which are working as all other emails are sending correctly) and junk notification rules. When i check a request (one created since the tech emails stopped sending) i can see that a technician auto-notification is not being generated - only the requester notice and the assigned tech notice is there.

Has anyone else seen this happen recently? This started approximately 21 hours ago.