As it turns out the certificates form CACert.org sucked. Please download the LCHSoft.net CA certificate instead. Read more about secure email
Users of the webmail system horde.lchsoft.net will notice that the old SSL security certificates are no longer valid. Signed certificates from CACert.org are now used for SSL security both for webmail and regular secure email. The old **.lchsoft.net certificates can be deleted from browsers and cellphones.