[imp] sudo sendmail problem

[Data Vortex]

Greetings,

I am currently trying to configure imp to work in concert with my antispam
local delivery agent (http://tmda.sf.net/).  This requires that the sendmail
wrapper be executed as the user sending the mail.  I have written a sudo line
to help solve this issue, but need help with the imp config.

In /horde/config/horde.php, I've set:

$conf['mailer']['type'] = 'sendmail';
$conf['mailer']['params'] = 
array('sendmail_path' => '/usr/bin/sudo -H -u $FIX$ /usr/bin/tmda-sendmail -t');

I need to interpolate the currently logged-in IMAP user there, how can I manage
that?

Thanks very much,

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