I submitted this on github as an Issue as well…
So, the GData plugin in Claws mail doesen’t work because it won’t correctly Authenticate with google… Says “Sign in with Google is Temporarly disabled for this App;This App has not been verified yet by google in order to use google sign in.”
Seens ti be a problem with the OAuth Verification see
here for more info: https://stackoverflow.com/questions/50509667/sign-in-with-google-temporarily-disabled-for-this-app
Basiclly someone affilitated with development just needs to go sign up for oauth verification for the App/Plugin so we can actually be able to use it again.