On Monday 30 July 2001 16:50, you wrote:
> Ok, how exactly does IMAP work and differ from POP3?  Is it anytyhing
> like how MS Exchange works and delivers email instantly without
> checking?  Heck I use pop3 at home but thought of trying out IMAP but
> I haven't read anything up on it or seen it live at work.

As others have pointed out, IMAP is generally implemented such that you 
can leave your email on the remote server, organizing it in folders 
there. Another difference is that most POP3 servers make you 
authenticate in cleartext: you send your password in plain text. While 
IMAP servers can also do this, they can also negotiate authentication 
in ways where your password cannot be sniffed. Of course, SSL can do 
this too. The IMAP servers that come with Red Hat are already SSL 
ready, and linked to a number of other security libs.

I am exploring the possibility of moving our Netware/Groupwise email 
system to Linux/Postfix/cyrus-imapd. Groupwise was fine years ago, but 
it is now complex and overkill: Novell's products have outgrown our 
needs.  Like Exchange and Groupwise, Cyrus IMAP keeps a centralized 
database of emails to improve performance (actually, it's essentially a 
maildir implementation with indexes, caches and other administrative 
files). This is in contrast to conventional email delivery, where the 
email is scattered over a number of home directories or (in the case of 
POP3) downloaded to a client machine.

One thing I like about IMAP is that you can interchange parts. You can 
mix and match IMAP mail clients on the user end, and a number of 
webmail proxies on the server side. 

Chris



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