Email configuration - need a proper way

I try to make my gmail to configure with erpnext and got me below.
Do I need to create email domain as gmail even erpnext provide to select service as gmail?

Hey @Sanath_Udayawansa2 i think you didn’t need to. You can click No on the dialog.
But if you want to create it’s okay too.
Email domain makes it easier for you to create a multiple new account with the same domain.