Less secure applications
Instructions on allowing access to less secure apps (LSAs)
Less secure apps are often referred to as LSAs. These are non-Google apps that can access your Google account with only a username and password.
Some apps and devices use less secure sign-in technology, which makes your account vulnerable. These few simple steps will need to be completed to support any of your preferred webmail application.
Select Security on the left-hand side
Scroll to "Less secure app access" and select Turn on access
Toggle "Allow less secure apps switch" to On