The address of webmail UI is webmail.forpsi.com
. The webmail uses only secured SSL connection. If you want to use your own domain in the URL, you should use the format https://webmail.yourdomain.tld. The certificate is created for the domain forpsi.com, your web browser will display information about not valid certificate. You will have to add a certificate exception in the browser in order to continue.
Because of not valid certificate some webmail services will not work properly (eg. add attachment in the classic version).