KMail and GnuPG signed messages from mutt users

Hi, If someone uses KMail and signs his messages, KMail of course displays the message with nice colors indicating that the message is properly signed, the usual and expected behaviour of KMail. But this dosn't happen if the signer uses Mutt, the the signature is then always shown as an attachment and no automatic check of the signature/message takes place. Is this due to the way Mutt produces GnuPG signatures ? Do Mutt users have to use some options to change that behaviour ? Nevertheless, it would be nice if KMail could handle this, no matter how Mutt does the signing of messages. Or is this issue already solved with KMail > 1.4.1 ? Thanx Malte