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Email Agents - Exercise

Objective: Match the following email agents with their descriptions.
This is a Java applet

This exercise uses a Java applet to allow you to match items in the left column with the items in the right column. If you do not have Java active in your browser or are behind a firewall that does not allow Java applets, you will not be able to complete this exercise. If you do not see the applet below, click OK, I'm Done to continue with the course. You will receive full credit for this exercise.

Scoring
This exercise is unscored. It's an opportunity for you to practice matching the email agents to their definitions. When you are finished, click the OK, I'm Done button to receive credit for completing the exercise.
Background/overview
The Internet email system uses several agents to transfer mail between users. You need to match the following acronyms with their descriptions.
Instructions
In the left column below are three terms corresponding to the three email agents. Their corresponding definitions are in the right column. Click a term in the left column, then click its definition in the right column to make a match.
When you have matched all of the terms and their definitions, click the Done button to see whether you've done so correctly--green lines mean the match is correct, red lines mean the match is incorrect. If you didn't get the matches right the first time, click Clear to erase your answers and try again.