Delivery Agents
The Delivery Agent is very similar to the user agent; it is merely a method of getting the actual message into the recipient's hands. For example, with conventional mail the recipient can walk out to the mailbox in his front yard or drive to the location of a post office box. Similarly, the recipient of email can use different methods of collecting his or her messages.
A POP Server
Post Office Protocol (POP) provides a way for end users to retrieve their mail. It's similar to you walking out to your mailbox, collecting the mail, walking back into your house, and sitting down and reading it. Using POP, email is delivered to the email client on your desktop when you indicate that you want to retrieve it. Often, the client desktop ...
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