[imp] Horde/IMP and mail clusters

[Tobias Drewry]

BOn Fri, 8 Feb 2008, Tim Bannister wrote:

>> I have successfully setup two qmail-ldap servers with its native
>> qmail-ldap clustering support. Using the mailHost (ldap) attribute, I
>> am able to send mail to someone and that mail will be correctly
>> delivered to the correct host as specified in mailHost. So, half of my
>> users will have their mails in server-A and the other half in
>> server-B. Both mail servers have IMAP and running fine. All user
>> accounts are stored in server-A.
>>
>> I have a third server (server-C) that I will use to run IMP (and some
>> web pages). How do I configure IMP so that it will know from which
>> server to get a particular mail from, for a particular user ? Can I do
>> this without any extra hardware?
>
> You can also write a preauthenticate hook that sets the IMAP server to
> the host on which their mail is stored.
>
> -- 
> Tim Bannister

At Boston University we do both.  We use preauthentication checking to 
determine which of the 10 mail servers someone's account lives on and 
reconfigure IMP dynamically to reflect the server involved.  Failing that 
we have an IMAP-Proxy which should route them to the right place, albeit 
with a few more hops.  The IMAP-Proxy is really there to handle external 
IMAP connections for our clients.

--
Tobias Drewry
Boston University