January 25, 2018
Dear (Employer Name),
Thank you for the wonderful opportunity to work here at (Company) for so long and to be able to accomplish (achievements). I am writing now with great regret to submit my formal resignation, as we previously discussed. My last day will be (date).
As it is my right and pleasure to do so, I would like to notify you that I will be appointing (Name) as my successor. (Name) has already shown tremendous talent, perseverance, knowledge and skill in (areas) and in (actions). I will transfer all of my (files/cases/materials) to (him/her) no later than (date), and I will spend (amount of time) training (him/her) in (roles/responsibilities).
Thank you for everything you've done for me in my (amount of time) here. I will greatly miss you and the rest of the staff.