Something along the lines of "thank you so much for the reply, the info was very useful. I went ahead and contacted the person you suggested." My first instinct is to be very formal in my emails, so I always appreciate others' input re tone.
Hi all, a quick question about "thank you" etiquette. I'm interested in applying to a grad program, so I wrote to a professor who was listed on its site as a contact for more information. The professor has replied (and very helpfully, too). Is a "thank you" email appropriate? My instinct is that yes, it is, but I'd like to hear your opinions, too. Thanks in advance!