First, click the envelope symbol next to the QQ avatar to enter the mailbox, as shown in the figure. You can also log in using mail.qq.com.

Click the Settings button at the top after entering the mailbox. Click the account menu.

Start the service under the account menu, as shown in the figure, start the SMTP service and how to set it up.

Click on what is IMAP, and their service ports will be displayed. The SMTP port number is 456 or 587.