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1. Google Mail OAuth 2.0
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Google Mail through SMTP/IMAP requires OAuth 2.0 (OAuth Wikipedia Link) for authentication. (More information : Google IMAP-SMTP Link).

!!! Proxy Configuration: If your server accesses the internet through a proxy, make sure to whitelist the following domains for Google Mail Authentication:
• oauth2.googleapis.com

Start by navigating to Google APIs & Services: Google APIs & Services Link
!!!Note: Ensure sure the GMAIL API is enabled at Enabled APIs & services. Google API Library Link





Go to the Credentials menu, click on Create Credentials, and select OAuth client ID:



Select the application type: Web application. Provide a unique name. Then, configure the Authorized redirect URI—this is where Google will redirect you after authorization. The Redirect URL must end with ?command=register_google_mail_api.

    http://127.0.0.1:9090/?command=register_google_mail_api

or

    
    https://your.crushftp.domain.com/?command=register_google_mail_api
    

Finally, click the Create button.



After the credentials are created, copy the Client ID and Client Secret.

2. SMTP Settings
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Now if your credentials are setup, and your redirect domains are configured, you can use the credentials in CrushFTP to get your google auth token and get access.
CrushFTP admin page url must match with the redirect url. In our example: http://XXXXcrushftp.com
In the Preferences -> General Settings -> SMTP Settings, at username SMTP Server Username put your google email address. Then click "Get mail refresh token" to get the "SMTP Server Password". Put your client id and secret on the appeared form.


If your domain is not verified you will get a warning message, click on Advanced and proceed further:



Click on allow:



Once it is finished the "SMTP Server Password" input field will be filled with the refresh token.