As some of you may already know, today is my last day as a teacher in (name of school or any other organisation). I just wanted to take out some time to thank all of you for your support and love during my stint here.
I would especially like to thank (add names) for guiding me in the early part of my career and (add name) for his constant support even in the most difficult times. I wish all of you the best for your future and hope that we can meet again. I will never forget what I have learnt in this place.
I am enclosing my contact details where you will find my new phone number and address at (name place). In case you need any help, do not hesitate to contact me. I am going to be in the city till this weekend. Till we meet again,