choosing server based on the url

[Ilya]

I have two domains on same box: domain.net and domain.org
servers.php reads:
$servers['imap'] = array(
    'name' => 'domain.net',
    'server' => 'domain.net',
    'protocol' => 'imap',
    'port' => 143,
    'folders' => '',
    'namespace' => 'INBOX.',
    'maildomain' => 'domain..net',
    'smtphost' => 'domain.net',
    'realm' => 'domain.net',
    'preferred' => 'horde.domain.net'
);

$servers['cyrus'] = array(
    'name' => 'domain.org',
    'server' => 'domain.org',
    'protocol' => 'imap',
    'port' => 143,
    'folders' => '',
    'namespace' => 'INBOX.',
    'maildomain' => 'domain.org',
    'realm' => 'domain.org',
    'preferred' => 'domain.org'
);

conf.php has
$conf['server']['server_list'] = true;
$conf['server']['server_list_hidden'] = true;

but whenever i login from horde.domain.org  the email address which imp
creates is still taken as domain.net
the users on both domains are the same. i just want correct from adress when
logging in from .net or .org.
Ive tried some experimenting, but so far nothing. what am i doing wrong?

using latest-cvs-everything. 2.3.7