Gmail IMAP Authentication Error Web Login Required

Gmail wants to promote the use of OAuth2 over simple username/password authentication.

If you use the password authentication, you may get an error saying “Web Login Required”.

If you don’t want to switch to OAuth2, then you need to go to your Google account’s setting (not Gmail setting).  Under “Sign-In & security”, look for “Allow less secure apps” and turn it to “ON”.

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