$config['force_uri'] = "domain.com";

[smtalk]

It'd be great to have an ability to set domain which roundcube should redirect to. When having a global alias in apache configuration, it's not possible to do that without changing apache config or RoundCube .htaccess. A simple configuration option:
$config['force_uri'] = 'domain.com';

Would solve it.

Change to index.php:
Find:
$host = preg_replace('/:[0-9]+$/', '', $_SERVER['HTTP_HOST']);

Replace with:
$host = preg_replace('/:[0-9]+$/', '', $RCMAIL->config->get('force_uri', $_SERVER['HTTP_HOST']));

[alecpl]

I'd rather extend meaning of force_https, so it can contain host:port value. Patches welcome.

[ArvydasRumsa]

patch.txt

Added host support for $force_https configuration option to redirect to a specified domain.

[alecpl]

Thanks. I modified the code slightly.