If you have problem with mailing with this setup then please contact your provider with those variables and ask correct info:
You can use gmail smtp too as shown in this example;
MAIL_DRIVER=smtp
MAIL_HOST=smtp.gmail.com
MAIL_PORT=587
MAIL_USERNAME=your gmail address
MAIL_PASSWORD=your gmail password
MAIL_ENCRYPTION=tls
If you have problem with mailing with gmail setup then please try to get Google app password and use that password as your gmail pass on MAIL_PASSWORD variable:
https://security.google.com/settings/security/apppasswords