Tencent Mail (@qq.com / @foxmail.com): Enable IMAP/SMTP + Generate 16-Digit Authorization Code (Full Laifaxin Binding Flow)
China's most popular Tencent Mail configuration — in web Settings → Account, enable IMAP/SMTP/POP3 service, SMS-verify to generate a 16-digit authorization code, paste it (NOT your QQ login password) in the Laifaxin password field. @qq.com and @foxmail.com share the exact same flow.