We have an issue with our instance of ManageEngine Service Desk in that replies to incidents are not being sent or recieved and are also not recorded in the incident history. Frequently users (technicians) reply to a helpdesk job and the reply window closes without error but no email is being sent to the requester or recorded in the system. They have to retype the reply and attempt numerous times before it succeeds.
The issue seems to be randon - ie. it works sometimes and not others.