How to disable outgoin mail logging ?

[miniwark]

I fell logging users activity bad regarding their privacy !

So how to disable outgoing mail logging fetaure ?
Alternaly how can i completly disable logging ?
(i am not against logging errors but there is to much errors for now about http headers)

I have try this in config file :
$rcmail_config['debug_level'] = 0;

But outgoing mail are still logged.

[miniwark]

I reply to myself

In Roundcube config set like this :-)
// Log sent messages
$rcmail_config['smtp_log'] = FALSE;