OK, there are 2 ways to do this.
The first way is to edit each of the files which contain the branding logos/text, these are:
main.inc.php - the welcome text and window titles.
login.html - the login logo
header.html - the logo in the top left of all screens after login.
Each file is edited to first check the domain via javascript, then pick an IMG or text to show based on the result.... but i've realised a far far better way.
Just do this.
(i have several domains named, webmail.domain1.com, webmail.domain2.com etc. All pointing to the the same virtual area on my hosting account, an all reference a single instance of roundcube, single mysql etc.)
Edit the main.inc.php file, and put the following at the start:
function getDomain() {
$host=$_SERVER['HTTP_HOST'];
$prefix='webmail';
$arr=explode('.',$host);
if ($arr[0]==$prefix) { unset($arr[0]); $host=implode('.',$arr); }
else { $host=''; }
return $host;
}
I've then added this:
$rcmail_config['username_domain'] = getDomain();
to allow my users to only use their ID and not the full email address.
then
// relative path to the skin folder
$rcmail_config['skin_path'] = 'skins/default/';
if (getDomain()=='domain1.com') {
$rcmail_config['skin_path'] = 'skins/domain1'; }
if (getDomain()=='domain2.com') {
$rcmail_config['skin_path'] = 'skins/domain2'; }
to force a skin based on the domain name.
then
// use this name to compose page titles
$rcmail_config['product_name'] = 'WebMail';
if (getDomain()=='domain1.com') { $rcmail_config['product_name']='domain1.com WebMail text'; }
if (getDomain()=='domain2.com') { $rcmail_config['product_name']='domain2.com WebMail text'; }
to change the welcome text at login based on the domain name.
and thats it.
let me know how you get on, it seems to work fine with my setup.