#5 mime-support: Mails with PGP.asc attachement do not decrypt

[Anonymous]

Mails which are received with a pgp.asc-attachement will bring only
the message: "This message was not signed. There is no guarantee
that the sender is who he or she is claimed"
When the ok-button is clicked does nothing happen

Entourage 2004, Mac OS 10.4.2, gpg 1.4.1