Sophos PureMessage for Microsoft Exchange 3.0 before 3.0.2 allows remote attackers to cause a denial of service (EdgeTransport.exe termination) via a TNEF-encoded message with a crafted rich text body that is not properly handled during conversion to plain text. NOTE: this might be related to CVE-2008-7104.
https://exchange.xforce.ibmcloud.com/vulnerabilities/52925
http://www.sophos.com/support/knowledgebase/article/44385.html