MURDER or IMAP proxy solution ?

Earl R Shannon ershanno at
Thu Jul 1 08:55:25 EDT 2004


Well, the uniform name space means a couple of things. First, each 
user's account has a unique name. Not just on the IMAP server where 
their account resides, but across all the IMAP servers that are part
of the MURDER. This allows the accounts to be on any machine in the
MURDER. This allows the MURDER to be referred to by one hostname in
DNS, ie "mail.some.domain" because the murder keeps track of where
things have to go. Whether its for deliver of email or the connection
of a client. It's the client connection part that brings the shared
folders into the mix. Usually a client program or MUA ( Mail User Agent)
is configured with the username/server where the persons account 
resides. This gets them to their inbox. But what if an organization
has some shared folders? And what if those shared folders are on another
machine? A second server must be configured in the MUA to allow the
connection to the server where the folders are. If using a MURDER this 
second server would not need to be configured in the MUA. The client 
program sees one "uniform name space" where all the folders reside with 
only configuring ONE name for the email server in the MUA.

Earl Shannon
Greg Pulfer wrote:
> Hi there,
> I was reading the latest Cyrus IMAPd 2.2.6 documentation especially this 
> page:
> Now I saw the following phrase:
> "Sites which think they need the Murder functionality but do not need a 
> uniform namespace (no shared mailboxes) should consider other IMAP proxy 
> solutions."
> This made me wonder if I really need the MURDER functionality... First 
> of all can someone exlain me what is a "uniform namespace (no shared 
> mailboxes)", I am not sure if I need that or not. If I could use a IMAP 
> proxy solution and that would make everything simplier I would go for 
> it. Would I acheive the same horizontal scalability with an IMAP proxy 
> solution as with a MURDER solution ?
> Well to explain my case a bit I would like to install a mail 
> architecture for an ISP which currently has approx 200 mailboxes but it 
> will grow and grow and grow, that's why horizontal scalability is needed.
> Thanks
> Regards
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