I have been with [name of company] for [number] of years, and the time has now come for me to move on to a new stage of my career path. I will be resigning, effective [date of resignation] and would like to thank everyone for the opportunity of working for this esteemed institution.
I thoroughly enjoyed being a part of this team with many outstanding members. It was a great pleasure and honor to be working for [name of company]. I will surely miss working in this institution. I have not encountered other organizations that treat their employees, clients, and partners in the same manner as that in this fine institution.
I wish [name of company] continuous success and growth for the long term. My farewell and best regards to everybody!