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Google blocks G Suite access for apps that only rely on usernames and passwords
A couple of years ago, Google starting warning users that certain third-party apps that access its business-oriented G Suite might not be secure. Now, it's taking that to the next level by blocking any "less secure apps (LSAs)" that try to access G Suite with only a username and password. Going forward, Google will only support the much more secure OAuth system, which it first adopted for Gmail way back in 2010.