MailScanner and Horde/IMP

[Krishna]

Hi,
        I installed MailScanner on my RedHat 7.3 box running Horde/IMP cvs
version.
When I send mails through Outlook or Eudora , the mails get scanned by
MailScanner, does both Anti-Virus and Anti-Spam checks.
But when I send through Horde/IMP mailscanner does not get executed. The
mails goes without a scan via sendmail.

Why is this happening?

My horde configuration conf.php

$conf['mailer']['type'] = 'sendmail';
$conf['mailer']['params'] = array();
  $conf['mailer']['params'] = array('sendmail_path' => '/usr/sbin/sendmail');

regards
Krishna
http://www.KrisinDigitalAge.com