Add support for Oauth

[pieroliviermarquis]

Add support for Oauth.

As per google:

On May 30, you may lose access to apps that are using less secure sign-in technology.

To help keep your account secure, Google will no longer support the use of third-party apps or devices which ask you to sign in to your Google Account using only your username and password. Instead, you’ll need to sign in using [Sign in with Google] or other more secure technologies, like OAuth 2.0.

What do you need to do? An app or device which uses Simple Mail Transfer Protocol (SMTP) to send emails using your Google Account has less secure access to your Gmail. This might be an older device, like a printer or scanner. To continue using your Google Account with this app or device:

App - Remove your Google Account from the app or device and sign in again using Sign in with Google Device - Change your device’s settings so you’re using more secure sign-in technology