[imp] autologin based on redirect.php

[Liam Hoekenga]

> It should work if you set $HTTP_POST_VARS['server'] to the _key_ value of
> the prefered server and set $conf['server']['server_list'] to 'show' or
> 'hidden'.

Could I get it to support multiple values from within servers.php w/o having to
do conditionals in my script?  

Ie, say i've got entries like this in my servers.php
$servers['ourserver'] = array (
    ...
    'preferred' => 'mail.umich.edu'
);
$servers['theirserver'] = array (
    ...
    'preferred' => 'theirwebmail.umich.edu'
);

and I want to use the same installation to service both, just answering to
different virtual hosts.  It seems if I allow IMP to display it's login screen,
it chooses the right mailserver... can I replicate this in our autologin script?

Liam