Just so you know, I made up some extra emails to pad out this tag. Let me know if any details here needs to be retconned!

(Contents below cus' the courier font can be a little hard to read):

Subj: ALERT
Contents: DO NOT TURN OUT THE LIGHTS

Subj: NOTICE: System Maintenance on x/x/xx
Contents: Dear all, please be aware that system maintenance will take place on...

Subj: IMPORTANT: Changes to Laboratory Regulations
Contents: As announced last week, regulations for Laboratories have been updated. We need to check that we are still compliant...