How to send mail using gmail?

Question

Yii

Expected response code 250 but got code "535", with message "535-5.7.8 Username and Password not accepted. Learn more at
535 5.7.8 https://support.google.com/mail/?p=BadCredentials e88sm1040527lji. 26 - gsmtp
"
I get this error, is it gmail or not?
in file common/config/main-local.php

'mailer' => [
            'class' => 'yii\swiftmailer\Mailer',
            'viewPath' => '@common/mail',
            'transport' => [
                'class' => 'Swift_SmtpTransport',
                'host' => 'smtp.gmail.com',
                'username' => '[email protected]',
                'password' => '123456',
                'port' => 465,
                'encryption' => 'ssl',
                ],

            'useFileTransport' => false,
        ],

Or am I doing something wrong?
Untrusted apps are allowed and still have this problem