Dear Ms. Jones,(称呼)
My name is Ann Brown, the sales manager of ABC Comapny. (自报姓名与身份) I am writing to inform you of the mistakes you made .... (回指段,提及前一次的沟通和本次通信的目的)
There are mainly two mistakes. ... (事由段,本次通信的主体内容,一般一个任务点分一段写)
I am looking forward to hearing from you. (展望段,表达对事态发展的期盼与愿望,套用常用语句即可)
Sincerely yours, (结束语与签名)
xxxx