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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.

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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 2.0Link
!!! Note: To obtain the Refresh Token, the CrushFTP WebInterface’s host and port must match the Redirect URL specified in the Azure App Registration. In our example, it was: http://localhost:9090 or https://your.crushftp.domain.com/

Click on Get Refresh Token button. Enter the Client ID (See at App Registration -> Overview -> Application (client) ID), Client Secret (See at App Registration -> Manage -> Certificates & secrets) make sure to copy the value field, not the ID, and Tenant ID (See at App Registration -> Overview -> Directory (tenant) ID). Proceed with the authentication and authorization process.
!!! Note: Be sure to sign in with the Microsoft Account that has the necessary permissions, as configured in the Azure App Registration mentioned above.
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