Dear “Urgent” requester,
I understand that you want me to do something urgently but the fact that you write “urgent” on an unsolicited email does not (unless you are my boss or you are responsible for a significant amount of my funding) – make your request urgent.
If you send it to me between 4.30pm and 5pm when I am watching the clock I will be likely to treat it with the contempt it deserves.
Perhaps if the job is so urgent it is your planning process that needs timely revision.
That is all.