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Email is very similar to our postal mail system. You can email to friends who use the Internet, AOL or other networking services. The difference between Email and the postal mail is the process.
| Email System |
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| You type a message in an email program |
The email program asks your server to send it |
Your server sends it to your friend's server |
Your friend's email program fetches it |
| Postal Mail System |
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| You write a message and put it in an envelope |
You drop it in a post box |
The postal service delivers it |
Your friend fetches it from the mail box |

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