How do I set referrals (to another server) on per user basis?

[Ryan Tokarek]

We have a rather annoying setup right now where we have one imap server 
that mounts user home directories over NFS to provide imap services to 
users. Home directories are split across 3 separate servers. The 
network and CPU load introduced by this is noticeable and getting worse 
for a number of reasons.

It would be much better to have user go to imap on the relevant 
home-dir server rather than to a server that mounts everything over 
NFS. With the home directory servers separated like this, users would 
have to know which server their home directories are local to unless 
there was a central server they hit first that could refer them on to 
another server.

A proxy would do if it could figure out which server to relay this on 
to, but it would be better to do referrals.

As far as I can tell from RFCs this should be possible. Referral is 
mentioned a number of times in source. I just haven't figured out how 
it gets set, and I've not found the right search string if its in the 
list archives (so sorry if this has been asked before).

How can I set referrals to other servers on a per user basis? Can I 
even do it, or should I be looking at something else?

Thanks,
Ryan Tokarek
Unix Sysadmin
Wolfram Research Inc. 

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