哦，信头是发信人域写信人的地址。

And how to write the address?

youdao

写信人的地址位于信纸的右上角，被称为“信头”，地址后面总是接着日期。

The address appears at the top right-hand corner of the page. It is called "the Heading". The address is always followed by the date.

youdao

写信人的地址位于信纸的右上角，被称为“信头”，地址后面总是接着写日期。

The address appears at the top right-hand corner of the page. It is called 'the Heading '. The address is always followed by the date.

youdao