Why can't I set up Gmail as the SMTP server using Google OAuth in QTS 4.3.4 (or older versions)

Last modified date: 2023-05-17

QTS 4.3.4 or older versions
SMTP
Notification Settings

Since Gmail updates the authentication method, the authentication method in QTS 4.3.4 (or older version) is no longer valid. perform the followings:

Upgrade the firmware to latest version and use Notification Center to set up Gmail.
If QTS 4.3.4 (or older versions) is the latest firmware of the NAS (the NAS should be an End-Of-Life model ), using another SMTP provider to replace Gmail service.

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