i've found the solution: about:config in iceweasel and insert a new key/val pair:
key: network.protocol-handler.app.mailto val: kmail #or which mail app you want to use. additional network.protocol-handler.external.mailto should be set to true. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
