Can't fetch Kolab-indeendent IMAPS account with Kolab's Horde(3)

[Johannes Graumann]

Hi all (Hi Gunnar ;),

It's against policy to forward email of my new work mail account to my 
server, so I set out to use Kolab's Horde to aditionally fetch that mail via 
IMAPS and independent of Kolab. Under Hode's options I navigated to "Mail --
> Fetch Mail --> Edit your preferences for acessing other mail accounts" and 
filled in what actually woks when using Kontact (Kde4).

Whenever I try to fetch mail I get the following error:
> Fetchmail: Cannot connect to the remote mail server: Certificate failure 
> for email.qatar-med.cornell.edu: unable to get local issuer certificate:
> /C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance CA-3

Can anyone point me into the right direction for fixing this?

Thanks in advance.

Joh