Out of Office
Just a teeny suggestion. Don't list "your" secretary as a contact in your out of office message when you indicate you are not available. Chances are, that person doesn't care to be contacted about business only you can handle anyway. And the person who made the request isn't interested in talking to your secretary about your business. That person is writing to you. Just a teeny suggestion. And really, professor friends, how many of you "have" a secretary anyway?