Microsoft Outlook Vulnerability: S/MIME Loss of Integrity

Microsoft Outlook (all versions) suffers from an S/MIME loss of integrity
issue.

Outlook does not warn against a digitally signed MIME message whose X509
EmailAddress attribute does not match the mail's "From" address.

Full details:
http://www.defenceindepth.net/2013/06/smime-bucking-phishing-trend.html