I recently finished taking an undergraduate class and I enjoyed it. I was thinking of emailing the prof and saying this, but I don't know if it's appropriate or not, for a few reasons:
I would have already said this in the class evaluations, which the prof will read.
More importantly, I recently received my final grade and it was good (A to A+). If I email now, it might come off as an implied "thank you" for giving me a good mark, even though I mean nothing of the sort.
My question is whether or not such an email would be appropriate. In the email, I would also express gratitude for the extra effort the prof put in (as they gave me resources to study the subject deeper on my own).