Making an appointment regarding letters of recommendation My University is currently on break, so I'd be making the appointment by email, and then meeting separately to discuss it.

In the email, is it a good idea to say explicitly that the appointment is regarding letters of recommendation? It seems like it would be, but on the other hand that seems tantamount to "asking via email," which of course is frowned upon when we're in the same city. Any thoughts?
This may vary between departments, countries (I'm in the U.S.), etc., but I'd say:


When making an appointment, it's almost always a good idea to specify what it will be about.  When someone doesn't have a lot of time, this helps them figure out how soon the meeting needs to be scheduled, and it gives them a chance to prepare for it.  The one exception I can think of is very delicate topics.  For example, if you are meeting with someone to discuss an ethical matter, there might not be a short description you can give that wouldn't risk be misleading or omitting important context.
I'm not aware of a belief that asking for a letter of recommendation via e-mail is rude or problematic (although of course this may depend on the local culture).  In fact, I would prefer to be asked by e-mail.  Partly it's just because I generally prefer e-mail for things that can be handled that way, since it's less disruptive.  Partly it's because awkward situations are a little easier for me to handle by e-mail.  For example, if a student didn't do well in my course, I may point this out and ask whether there's someone else who could write a more compelling letter.  It's easier for me to find the right words in writing, rather than on the fly in a conversation.