Why can't I connect to my mail client?

Question

Email

I am getting an error when connecting to my email client.
First it was thunderbird, then seamonkey and now outlook.
Everywhere the same error

I specifically changed the password from gmail mail and double-checked it.
When creating a new account in outlook, I prescribe this password, but again it does not work.
What could be the reason?

Answer 1

Setup instructions
Go to your Google account settings Security & sign in and allow insecure apps