Dear Sirs,
Thanks for your support and cooperation to our company.
Please be informed that I am going to resign from the position owing to some personal factors. All of the business would be followed by colleagues, who will contact you later. Please give them support as well.
If you are in need of my assistance, please don't hesitate to contact me. I will spare no effort to satisfy your requirement.
Best reagards,
***(署名）
