As you know, InfoPath browser-enable template supported for filled in via web browser and MS InfoPath.  This will make this solution similar like real working life style.  Some time you can not access to Intranet or company portal but you have to submit some docuement for approval on the system.
In this case you can filled in the from and send to email account that provide for this form library.  Yes that’s all you have to do.
ok, let’s share your expr on InfoPath and SharePoint.
Have a good day