[RCU] Problem with sender identities

Dear all, Is there any way to change the sender identity based on the email service domain? Here is my scenario: horde provides the webmail service for two domains: .student.domain.com .profs.domain.com The email addresses are created in the following way: username@student.domain.com (for the first) username@domain.com (for the second)

However, with this configuration:

$rcmail_config['default_host'] = array( ‘profs.domain.com => ' domain.com ', 'student.domain.com' => 'student.domain.com', );

The roundcubemail creates the sender identity for the second domain like this: username@profs.domain.com , which is not valid to send emails. Is there any way to set up roundcube the way I need? Thank you