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Set Username E-mail Domain

First, edit config/config.inc.php and set:

$config['mail_domain'] = 'hostname.tld';

where hostname.tld is the domain name you want to set.

After that, the database needs to be updated:

UPDATE users SET mail_host='hostname.tld';

Do not Override Skin

To prevent the users from changing the roundcube skin, add:

$config['dont_override'] = array('skin');

to config/config.inc.php.