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Email Has The Power Of One-To-Many
You can send an email to several people in one simple action. Communications can be divided into four types depending on the number of parties participating in the information transfer: (1) one-to-one, (2) one-to-many, (3) many-to-one, and (4)many-to-many.
Each type of communication has its own attributes and strengths. For example, the typical phone call is one-to-one, and the typical meeting is many-to-many. Email is the most successful one-to-many technology, with respect to both sending and receiving:
The key advantage of this one-to-many communication is efficiency, since instead of sending emails individually, you can save large amounts of time by sending one email to several people at once (also see address groups).
Similarly, when you receive an email from an Internet mailing list you are getting information that would probably be impractical to receive any other way, since most organizations don't have the time or resources to send out paper based notices individually to hundreds or even thousands of people.