6、I am glad to hear that you were appointed..., on which I congratulate you most heartily.

7、I congratulate you upon your success. 

8、I wish you still further success. 

 

第五，正文常用语 

1、I am writing to confirm/enquire/inform you... 

我写信是要确认/询问/通知你... 

2、I am writing to follow up on our earlier decision on the marketing campaign in Q1. 

我写信来追踪我们之前对于第一季度营销活动的决定。