[imp] mailing over smtp doesn't work

[Tomáš Macek]

Hi,
I've set up this configuration in horde/horde.php:

$conf['mailer']['type'] = 'smtp';
$conf['mailer']['params'] = array('host' => 'mail.ourserver.cz');

In the horde/imp/servers.php I have:

$servers['pop3lit'] = array(
    'name' => 'Ourserver (POP3)',
    'server' => 'mail.ourserver.cz',
    'protocol' => 'pop3',
    'port' => 110,
    'folders' => '',
    'namespace' => '',
    'maildomain' => 'ourserver.cz',
    'smtphost' => 'mail.ourserver.cz',
    'realm' => 'cz',
    'preferred' => ''
);

The problem is, that horde/imp project is located on the different machine, than the mail server. When I try to send a mail via IMP, IMP tries to send the message via localhost. It doesn't try to send it via other host (mail.ourserver.cz). I set up no other option. What can I do with it?

Thank you very much for help