I found it in QQ mailbox. I wonder if it will help you. You can also go and see for yourself. Enter a mailbox, click Settings, and then enter an account. There is a POP3/IMAP/SMTP service, followed by a help link. Go inside.

How to configure the mail client to use IMAP service?

Please ensure that your client supports IMAP protocol. Currently, the supported protocols are:

E-mail client:

Foxmail

Outlook Express

Looking forward to 2003

Looking forward to 2007

Wireless devices:

iPhone

Windows Mobile

Intelligent mobile terminal operating system

Note: Mobile Internet users need CMNET network to use IMAP server.

If your mail client is not listed above, you can try the following general configuration:

Receiving mail server: imap.qq.com

Outgoing mail server: smtp.qq.com

Account name: your QQ email account name (if you are a VIP email, you need to fill in the complete email address for the account name).

Password: Your QQ email password.

E-mail address: the complete e-mail address of your QQ mailbox.

How does IMAP service set SSL encryption method?

If your email client supports SSL, you can choose to use SSL in the settings.

The general configuration for using SSL is as follows:

Receiving mail server: imap.qq.com, using SSL, port number 993.

Outgoing mail server: smtp.qq.com, using SSL, port number 465 or 587.

Account name: your QQ email account name (if you are a VIP account or Foxmail account, you need to fill in the complete email address for the account name).

Password: Your QQ email password.

E-mail address: the complete e-mail address of your QQ mailbox.