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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 and create new credentials, choose OAuth client ID:



Choose Web application:


It is required to set up the Authorized Redirect URIs. You can domain (where your CrushFTP is available), or localhost. The URI needs to end with:

?command=register_google_mail_api

After Credentials are created copy the Client ID and Secret.

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.