letter to a teacher

[Unregistered]

I would like to know how I should address and end my letter I am writing to one of my university teachers.

[julianort]

you can try this:

Dear Professor [Last name]:
(if the teacher is not a professor, then use "Mr." or "Ms")

I am a student in [class name] that you teach.

.......

Sincerely,

your name here.