This is a simple one, mimicking the sort of quick emails that coworkers send to each other. This one depends on authority and familiarity to get someone to buy iTunes cards without checking on the situation using other means of communication.
If you hit reply to the email, it goes to the source email which may have the same screen name but different address. It also says your supervisor can’t take calls right now.
I have included the usual reply email you get if you engage in conversation.