First, login 163 mailbox, on the home page to find "settings."
Click "Settings", select "Pop3/smtp/imap" In the Drop-down tab, and the interface shown in the following figure appears. You can see that you have to open the client authorization code to start the SMTP service.
Third, click on the opening of the customer authorization code after the following interface, check the "open" option.
If your 163 mailbox is bound to the mobile phone will appear in the image shown in the window, asking you to enter the verification code. If there is no binding you need to first bind the phone and then do the next operation.
Five, when the correct authentication code will pop up the window to ask you to enter the client authorization password, this is the password you have on the third party client's mailbox login password, if the Third-party client input before the mailbox login password will be wrong.
Six, after setting up the client authorization password, we completed the mailbox SMTP service opening.