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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. This is part of Google’s effort to enhance security by deprecating less secure app access (basic authentication using just a username and password). OAuth 2.0 offers a more secure, token-based system that supports modern features like multi-factor authentication, granular permission scopes, and token expiration for better protection against credential theft. For technical implementation details, see Google’s documentation here : 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.

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2. SMTP Settings
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Navigate to Server Admin -> Preferences -> General Settings -> SMTP Settings:



SMTP Server Used for Emailing: Enter the SMTP server address used for sending emails, such as smtp.gmail.com, using the default port 587.

    smtp.gmail.com:587

SMTP Server Username, Password: If the SMTP server address ends with gmail.com, the corresponding Get Refresh Token button will appear. Click that button to proceed.
!!! Note: To obtain the Refresh Token, the CrushFTP WebInterface’s host and port must match the Redirect URL specified in the Google APIs & Services-> Credentials -> OAuth 2.0 Client IDs. In our example, it was: http://127.0.0.1:9090 or https://your.crushftp.domain.com/

Enter the Client ID , Client Secret. Proceed with the authentication and authorization process. !!! Note: Be sure to sign in with the Google Account that has the necessary permissions, as configured in the Google APIs & Services-> Credentials -> OAuth 2.0 Client IDs. This will automatically configure the SMTP Server Username and SMTP Server Password.



If the domain is unverified, a warning message may appear. Click Advanced and choose to proceed:



Click on the Allow button:



From email address: You must also specify the From email address. !!! Imnportant The From address must exactly match the signed-in Google user’s email address (i.e., the account used to obtain the refresh token). Otherwise, SMTP authentication will fail.

Make sure to enable the SSL/TLS flag to ensure a secure connection.

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3. PopImapTask
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Select the IMAPS protocol.
See the description: Google IMAP-SMTP Link



Host:

    imap.gmail.com

Port: 993
If the Host contains gmail.com, the corresponding Get Refresh Token button will appear.
Configure the 1. Google Mail OAuth 2.0 Link

!!! Note: To obtain the Refresh Token, the CrushFTP WebInterface’s host and port must match the Redirect URL specified in the Google APIs & Services-> Credentials -> OAuth 2.0 Client IDs. In our example, it was: http://127.0.0.1:9090 or https://your.crushftp.domain.com/

Enter the Client ID , Client Secret. Proceed with the authentication and authorization process. !!! Note: Be sure to sign in with the Google Account that has the necessary permissions, as configured in the Google APIs & Services-> Credentials -> OAuth 2.0 Client IDs. This will automatically configure the PopImapTask's Mail Username and Mail Password.



If the domain is unverified, a warning message may appear. Click Advanced and choose to proceed:



Click on the Allow button:



!!!Note: Since the email address is required after obtaining the refresh token, the Mail Username field must be adjusted.
Enter your email address followed by a tilde (~) at the beginning of the Mail Username field.

Mail Username : <<your email address>>~<<what was before>> 

More info: Link