Google to restricts access to IMAP, SMTP, POP to OAuth this year

As part of our commitment to user safety, Google Workspace will no longer support the sign-in method for third-party apps or devices that require users to share their Google username and password. This antiquated sign-in method, known as Less Secure Apps (LSAs), puts users at an additional risk since it requires sharing Google Account credentials with third-party apps and devices that can make it easier for bad actors to gain unauthorized access to your account.