Alex, Your email is very polite. The only change I would make is to put a comma after Prof. Smith .
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extremedeveloper1) Can “You are welcome and Please don’t mention it” be used together?
(I know that both of them are used in response to “thank you” but I have done this for more emphasis, is that wrong?)
2) “like it” or “liked it” and why?
3) “th