怎么用英语邮件跟以前的客户保持联系?

问题描述:

怎么用英语邮件跟以前的客户保持联系?
主要是该怎么开始和结尾.

开头一般是:
Dear XXXX,
It has been a long time since last.
结尾可以这样:
Hope you have a fine day.
或者 I am looking forward to seeing you ..