Email is the best cost-effective method for communication from anywhere in the world. The main important features of email are below: You can set automatic reply to emails., Also set auto-forward emails., Facility to send same email message to many people at a time., If your email is not delivered, you will get notification for your attention., Facility to attach and send files as a different formats like Doc, PDF, ZIP, Image, Video, text and many other file formats will support and can send.