[horde] Problems with Send a Mail

[info@web-front.de]

Hello,

my System: Debian sarge, Horde 3.0.9, IMP 4.0.4, Turba 2.0.5

Problem:

I will send via IMP a EMail. Follwoing Error can I See:
Beim Versenden der Nachricht ist ein Fehler aufgetreten: unable to authenticate to smtp server


Regards
Thomas


/imp/config/servers.php:

$servers['imap'] = array(
    'name' => 'IMAP Server',
    'server' => 'mail.meine-domain.de',
    'hordeauth' => false,
    'protocol' => 'imap/notls',
    'port' => 143,
    'folders' => 'mail/',
    'namespace' => '',
    'maildomain' => 'meine-domain.de',
    'smtphost' => 'mail.meine-domain.de',
    'smtpport' => 25,
    'realm' => 'meine-domain.de',
    'preferred' => '',
    'dotfiles' => false,
    'hierarchies' => array()
);

/horde/config/conf.php:

$conf['mailer']['params']['host'] = 'mail.meine-domain.de';
$conf['mailer']['params']['port'] = 25;
$conf['mailer']['params']['localhost'] = 'meine-domain.de';
$conf['mailer']['params']['auth'] = '1';
$conf['mailer']['type'] = 'smtp';