I'm going to go ahead and assume this course thing is complete fiction and actually you want to know who sent you an email.
If its dodgy, threatening or whatever and you are severely worried about it, you can contact the police though I am not sure how much they can do, unless you have an idea who sent it. Still any form of stalking is obviously very serious and should be reported and logged in as much detail as possible. I hope this isn't the case here.
If that isn't the case then I'd worry why you want to know the location of someone sending you emails. Unless you are in law enforcement in some capacity, you won't be able to track down too much information. And if you were, there are still tons of limits to tracing IP addresses etc, as mentioned above.
Frankly this whole topic is bizarre.
