August 1999
Intermediate to advanced
378 pages
11h 44m
English
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Retrieval of Mail by MRAs
When the Internet mail system was conceived, most users read mail directly from their mailboxes. Now, messages written to a server-side mailbox may need to be read by a machine across the Internet. Different machines may be used by a user each time she accesses her mailbox. These are the problems solved by MRAs. An MRA is really a client/server system: the server provides access to the user’s mailbox on the MTA’s machine, and the client is generally integrated with an MUA.
The Internet has two protocols for MRAs: the older and simpler Post Office Protocol (POP) and the newer and more complex Internet Message Access protocol (IMAP).
The Post Office Protocol was developed as a follow-on to UUCP. It allows a user whose Internet connection is intermittent to connect and then download mail from a server to a local mailbox. Although it is possible with POP to leave copies of messages on the server, the remote mailbox management functions are very limited. A user may retrieve (copy) messages to a local machine and optionally delete them from the server’s mailbox.
POP solves many problems for those whose Internet connection is intermittent but does nothing for those who have no way to keep a local mailbox. Users of network computers, for example, have no local storage. And what about mobile users using a desktop machine while in the office and a laptop while traveling? Synchronizing mailboxes between machines is problematic at best. New generation hand-held computers ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.