Synology NAS: 535 Login Fail displayed when using QQ service provider in notification settings.
The test email could not be sent. Please check your settings and try again. 535 Login Fail. Please enter your authorization code to login. More information in http://service.mail.qq.com/cqi-bin/help?subtype=1&&id=28&&no=1001256
The reason for the failure is that the QQ password set by Synology Login is not the login password, but the authorization code.
Log in to QQ mailbox:
https://mail.qq.com/
Login - Settings - POP3/IMAP/SMTP/Exchange/CardDAV/CalDAV Services
If the management service is not enabled, enable it first. Manage if enabled
Verify the security
next step - continue to verify and get the authorization code
Copy the authorization code to the password box (Synology - Settings - Notification Settings - Supplier Password)
QQ mailbox successfully received
