[horde] S/Mime not verified

[Andreas Mauser]

Hi,

in an S/MINE Email I get:

Die Daten in diesem Nachrichtenteil wurden mit S/MIME digital signiert.
Die Nachricht konnte erfolgreich überprüft werden aber nicht das  
Zertifikat des Unterzeichners.
Absender: PSW GROUP Support (support at psw.net)

That means that its digitally signed and the message could  
successfully checked, but the certificate of the signer could not be  
verified.

Since I imported my S/MIME Certificate in Horde I thought that should be fine.

Is there something I have overseen?

Kind regards and thank you,
Andreas
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