如果不知道的话，可以假装是他的顾客发封邮件过去然后看回信的邮件头。

If you don't know it, write him an email pretending to be a customer and look at his return headers.

youdao

如果不知道的话，可以假装是他的顾客发封邮件过去然后看回信的邮件头。

If you dont know it, write him an email pretending to be a customer and look at his return headers.

youdao