Hide server textfield in Roundcube login screen
August 7th, 2010
When I opened Roundcube, the login screen asked me every time for a server name. This turned out to be pretty annoying since this is localhost all the time. In order to remove this field open /etc/roundcube/main.inc.php in your favorite texteditor and set the property
$rcmail_config['default_host'] = ‘localhost’;
Refresh your page and the server textbox has been disappeared.

Thanks this helped me out a lot.
if you’re using SSL you can set it to;
$rcmail_config['default_host'] = “ssl://localhost:993″;