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Electronic mail is one of the “stalwarts” of message transfer on the modern Internet, but is really designed only for communication within a relatively small group of specific users. There are many situations in which e-mail is not ideally suited, such as when information needs to be shared amongst a large number of participants, not all of whom may necessarily even know each other. One classic example of this is sharing news; the person providing news often wants to make it generally available to anyone who is interested, rather than specifying a particular set of recipients.
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Post office box as a place where we will send a letter to the some one. At the time we want send letter, a letter will be entered first to the mailbox before the mail is sent to retrieve to destination mailbox. Mailbox itself deliberately provided by the post office to ease the sender to send a letter, they need not be difficult – difficult to go to the post office directly, but enough to go to the mailbox that has been provided by the post office assigned in many place.
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