Priority

You may set a priority value for your jobs. the scheduler will execute the highest priority jobs first.

Some relevant technical details

While the Web-UI only allows you to set the priority for job groups (all emails generated by an ingress- or system-event) every single email has an individual priority value. Creating a high-priority job while a lower one is being processed the system will send out the high prioroty mail before continuing. (Job-groups are mainly a UX feature)