Answer:
1.Almost instantaneous
2.Cost of sending an email is zero or negligible
3.Emails can be sent in bulk
4.Email attachments - any digital document can be sent over email
5.Delivery is almost guaranteed
6.Email is accessible
7.Built in spell checking
8.Notification of new arrivals
9.Can be formal as well as informal
10.Automation
11.Email storage and management
12.Email security
by khanz