We are using a third party help chat software on our website - when all agents are offline, the online user can still send us a message through that help chat. I've configured the service to send offline messages to the support email address that is configured to create tickets in JIRA Service Desk.
Here's the current configuration for this incoming mail server:
Because that inbox has been successfully creating service tickets for a while now, it was not monitored and it was only after a spot-check that it was noticed that offline messages from this third-party help chat service were not creating service tickets.