Unable to setup IMAP gmail account

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For yahoo, see the following post :

Does K9 work with the new Yahoo security?

It works, but you have to generate a special password, here is Yahoo explanation : Generate and manage third-party app passwords Some older, third-party email apps (that do not use our Yahoo branded sign in page) require you to enter a single password for login credentials. To access your Yahoo Mail account on these apps, you’ll need to generate and use an app password. An app password is a long, randomly generated code that gives a non-Yahoo app permission to access your Yahoo account. You’ll…