If you want to create or maintain a professional relationship with your professor, you may want to thank them in person so that they get to know you better.

For example, say, “I wanted to express my gratitude for your class” or “Thank you for writing a letter of recommendation for me. ”

For example, say, “I’ll never forget the first lecture you gave. I knew I would learn a lot from this class because you went so in-depth on the very first day. ”

Write a simple, “Thanks” or, “Thank you” as the subject line.

Double check to make sure you’re sending your email from the right account.

Don’t be overly informal with them by calling them by their first name or not addressing them at all. Stick to how they prefer to be called by students.

Give your thank you note to your professor at the end of term or slip it under their office door.

Even if you felt very challenged, let the professor know you learned a lot and challenged yourself.

For example, they might have helped you look at graduate schools or given you pointers on other classes to take.

If they are your current professor for the term, consider saying thank you after grades are released.