Electronic mail (E-mail) is an electronic message transmitted over internet/computer network from one user to another. E-mail is a text based mail consisting of lines of text, and can include file attachments. These attachments could be pictures, documents, spreadsheets, audio files, video files etc. The key features of e-mail are as follows:

email messaging
  1. E-mail can be send to one or more than one person at the same time.
  2. The recipient of e-mail can open the e-mail at his/her convenience.
  3. Since messages are transmitted electrically over internet, it is a faster way to communicate with the people. Persons could be located in the same office, home, building, or anywhere in the world.
  4. E-mail messages can be send or received at any time and are typically send over a network (office network or more likely internet).
  5. If so desired, a copy of the e-mail message that the sender has sent can be saved in the sender's computer e-mail account for later reference.
  6. In addition to sending messages, e-mail is an ideal method for sending documents as attachments.
  7. E-mail has quite a few similarities as a regular postal service.
  8. A poster letter is send to a postal address.An e-mail is send to an e-mail address. E-mail address is much shorter.
  9. Just as in the case of a postal letter, the sender of e-mail composes the message and sends it to the e-mail address of the recipient.
  10. The postal letter is normally put by the postman in the letter box outside the house. Similarly an e-mail is received by the recipient in the inbox of the e-mail application.
  11. While postal letter travels from the sender's office to via the postal bus/ train/ air/ postman, the e-mail message travels electronically over the internet and computer network.
The recipient of e-mail can read the mail, forward it to another person, or reply back. The recipient can also store the e-mail of delete it.

E-mail address

To use an e-mail, can read the mail address. The e-mail address contains all the information required to send or receive a message from anywhere in the world. An e-mail address consists of two parts separated by @ symbol (spelled as at) - the first part is the user _name and the second part is host computer name. The e-mail address might look like:

Here crackerhyper is user_name and and are host computer names.

E-mail services

There are two kinds of e-mail services:
Application based e-mail is installed on the user's computers. The mail is stored on the user's computer (as well as a central server, typically for that specific organisation). Some of the examples of application based e-mail program are:
  • Microsoft Outlook 
  • Mozilla Thunderbird
  • Opera
  • Foxmail etc.
Web based e-mail can be accessed by the user from any internet connected computer anywhere in the world. Web based e-mail is not stored on the user's computer. Many Web based e-mail services are available such as,, etc.

E-mail message format

The e-mail message format is any e-mail software, whether application based or web based, has many common elements. Their arrangement on the user's computer screen may have a different look and feel, but the purpose of each of these elements is same.
From:                       Sender's email address.
To:                         Recipients' email address.
Date:                       When the email was sent.
Subject:                    The topic of the message.
Cc:                         E-mail address of the people, who have been sent a copy of the email. The recipients of the email can see all of the email addressed to which the copies have been sent.(Note: The full form of Cc is "carbon copy").
Bcc:                        E-mail address of the people, who have been sent blind carbon copies of the email. The recipients of the email (in to the Cc) do not know that the same email has been send to other email address in Bcc.
Message body:               The body consists of the text of the message and any attachments be sent.


  1. When multiple routers are used in interconnected networks, the routers can exchange information about destination addresses using a routing protocol. Each router builds up a routing table listing the preferred routes between any two computer systems on the interconnected networks.


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