OAuth2 for Email Importing
WHMCS includes OAuth authentication support for email importing through Gmail in WHMCS 8.1 and later..
To use OAuth for Gmail email with WHMCS, you will need to both configure Gmail as your mail service provider and create an app for it in the Gmail Cloud console.
What Is OAuth?
OAuth is a technology that authorizes apps or services like WHMCS to access another service, such as a Gmail account. It's more secure than traditional username-and-password authentication.
In addition to its security benefits, some mail providers require OAuth or have announced a requirement for it in the future.
How Do I Set Up OAuth for Email Importing for Support Department Emails?
You can configure POP3 importing with OAuth via Gmail when you create or update a support department at Configuration () > System Settings > Support Departments. Email Importing is an alternative to Email Piping and is not related to your Mail Provider.
For more information, see Setting Up POP3 Importing with OAuth via Google.