我写信是要告诉您我决定从……辞职了。
2、I have accept an offer by another firm and have decided to tender my resignation.
我意见接受另一个公司提供的职位，并且决定辞职。
3、My best wishes for the company’s continued growth.
祝公司生意兴隆，蒸蒸日上。
4、Please feel free to contact me at any time if I can be of further assistance in helping with a smooth transition.
如果我能为实现平稳的工作交接提供帮助，请随时联系我。