[imp] S/MIME verification error

[Sören Mindorf]

Hello all,

I've a problem with the S/MIME.

A fried has a valid S/MIME certificate but when I view it in horde it  
displays:

The data in this part has been digitally signed via S/MIME.
Verification failed - an unknown error has occurred.

How ca I debug it or know someone how to fix it?

The certificate is imported successfull in the addrssbook.

When I check it with different mailcients it is vaild.

Versions: Horde Groupwere 5.1.3
           IMP 6.1.6

My hodeloglevel is DEBUG but I can't see the problem in the logfile.

Regards,
Soeren