I-D ACTION:draft-gahrns-imap-mailbox-referral-00.txt

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       Title     : IMAP4 Mailbox Referrals                                 
       Author(s) : M. Gahrns
       Filename  : draft-gahrns-imap-mailbox-referral-00.txt
       Pages     : 9
       Date      : 05/19/1997

When dealing with large amounts of users, messages and geographically 
dispersed IMAP4 [RFC-2060] servers, it is often desirable to distribute 
messages amongst different servers within an organization.  For example an 
administrator may choose to store user's personal mailboxes on a local 
IMAP4 server, while storing shared mailboxes remotely on another server.  
This type of configuration is common when it is uneconomical to store all 
data centrally due to limited bandwidth or disk resources.        
         
Mailbox referrals allow clients to seamlessly access mailboxes that are 
distributed across several IMAP4 servers.         

A referral mechanism can provide efficiencies over the alternative 
"proxy method", in which the local IMAP4 server contacts the 
remote server on behalf of the client, and then transfers the data 
from the remote server to itself, and then on to the client.  The 
referral mechanism's direct client connection to the remote 
server is often a more efficient use of bandwidth, and does not 
require the local server to impersonate the client when 
authenticating to the remote server.                                                         

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ftp://ds.internic.net/internet-drafts/draft-gahrns-imap-mailbox-referral-00.txt"><ftp://ds.internic.net/internet-drafts/draft-gahrns-imap-mailbox-referral-00.txt>