邮件的开头，在称呼之后，通常会问候一下：
1.Hope you are well.
2.Have not heard from you for a long time, hope everthing is going well with you.
3.How have you been recently?
4.How are you doing recently?
5.It was good to hear from you. I am very well, hope you are the same.
6.It is my great honor writing to you.
