From owner-freebsd-chat  Fri Feb 14 11: 4:42 2003
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Date: Fri, 14 Feb 2003 11:03:12 -0800
From: Terry Lambert <tlambert2@mindspring.com>
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To: Brad Knowles <brad.knowles@skynet.be>
Cc: Rahul Siddharthan <rsidd@online.fr>, freebsd-chat@freebsd.org
Subject: Re: Email push and pull (was Re: matthew dillon)
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Brad Knowles wrote:
> At 11:09 PM -0800 2003/02/13, Terry Lambert wrote:
> >  No... but does  proxy really solve anything, then, more than
> >  a DNS rotor solves?  All it really does is add a single point
> >  of failure.  Unless you can target a subset of back end content
> >  servers, you might as well use DNS round-robin.  Using a proxy
> >  implies the back end replica problem is *already* solved.
> 
>         Yes, the proxy does solve the domain problem.  The user logs in
> with "user@domain", the proxy looks this up in the LDAP database,
> which then tells it which back-end server to contact.  You can
> decide, on a user-by-user basis, which back-end server they will be
> using for their mail.  If one back-end server gets overloaded, you
> can choose individual users to shift off to another machine.

I solved this particular problem by modifying Cyrus to know
about domains.  But the point was kind of that there are IMAP4
clients that strip "@.*" off logins, if they have "@" in them.


> >  Maybe I should say "doesn't deal with LDAP the way it should"
> >  instead?
> 
>         In what way?

The LDAP should be used to determine the set of back end servers,
not to strip the domain name, and use it to pick a domain-specific
back end server.  The reason this is true should be obvious: if it
doesn't, then the number of domains you can support is limited to,
at most, the number of back end servers.

-- Terry

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