How are you?
What I want to tell you today is that I have decided to study abroad. I have thought about this decision for a long time. I have discussed it with my parents and they are very supportive of me. Because I am still very young, after this year's work, I find that I still need to improve a lot, so I think I need to continue to study for another year.
I am very lucky to be able to serve you. Our cooperation is very smooth, and our company is a good company with good products and colleagues. My colleague xxx will continue to serve you now. I learned a lot from her. Thank you again for your support to our company. I wish you a smooth work and a happy life.
This is xxx writing from XXX company.
Sorry to tell you that xxx（离职员工）has left our company, I will take over his job in the company and service you for our business. I have been with our company for about 5 years, so I am confident I can deal everything well for you.
Please feel free to let me know if we can be further assistance for the business. Thank you very much.