I have send sample to you by express. You'll get it in a week. 我已经把样品通过快递寄给您了。您一周之后就会收到。

That's great. 那太好了。 

Please find the mail sent by me tomorrow. 明天请注意查收我寄给您的邮件。

Please find the mail sent by me tomorrow. 明天请注意查收我寄给您的邮件。

OK. It's high efficient. 好的。效率很高啊。