Okay, actually I thought it could be done by editing the roundcube.conf in the apache settings (vconf), but when i replace the certificate link Apache couldn't start.
Regarding to the imap and pop3 certificate, i replaced the imap-ssl.pem and pop3-ssl.pem in the /etc/courier-imap/ folder and...
Hello,
I have installed the default webmail and changed it to roundcube. Its working all fine.
But I would like to add the SSL certificat I have ordered for:
www.webmail.webpage.com
webmail.webpage.com
I have inserted the SSL in Tools & Settings -> Security -> SSL Certificates...