sending emails.. cause trouble on Multi email server system

[steve76]

Hi,
I am using Roundcube v
and I've configured it in order to receive and send emails .. connected to an email server A -> works perfect..
Now, I have added  the possibility to check out emails from another server ( email server B )

So, I can select on which email server I want to check out emails.....
into my config file I have

$config['default_host'] = array('ssl://email1.foo.com' => 'Email server A', 'ssl://email2.foo.com' => 'Email server Br')   ;             

and for smtp

I tried :              $config['smtp_server'] = '%n';

But sounds not to work out.... :-(

what should I do for " smtp" in order to send email to "emailx.foo.com" ??
                                                                                               
Thanks and regards,

Steve

[JohnDoh]

try %h