We have come across a problem where a technician has left the company, subsequently had there email account deleted and the SDP account suspended. 

A requester has re-emailed into SDP opening the call that was assigned to the technician that left; SDP then tried to send an email notification to the technician and had an 'Undeliverable' bounce back. SDP got caught into a loop of emailing the technician and receiving undeliverable every minute for several days. 

I only noticed this by chance; could not open the call as the page wouldn't load and when I tried to delete the call SDP crashed when Java ran out of heap memory. 

The call is currently sat in the queue assigned to another technician. 

Mike