I received a warning messages from Google a couple of days ago. GMail is no longer supporting password-based login or special privileges for third-party apps. If your email client wants to access your GMail account, it must support OAuth2, so that it can use Google's own authentication service. For example, Mozilla Thunderbird works just fine (I tested it); I read that the latest versions of MS Outlook are also fine. For me, this is a high motivation to get rid of my GMail accounts, and move to some real, privacy-friendly email provider.