請問yahoo mail可唔可以設定某一封mail在某個日子寄出???

Yahoo mail does not have this function, 設定某個日子寄出, but you can use Outlook to do that. Use your email account from your service provider, for example [email protected], via Outlook composing the email. When you are ready to send, click on Message options and you will be able to send the message on a specific date and time.

Note: Your PC and internet must be on in order to do so while you were off on vacation.