Secunia Security Advisory – Red Hat has issued an update for mailman. This fixes a vulnerability, which can be exploited by malicious people to spoof messages.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/61005/sa27669.txt
Source: https://packetstormsecurity.com/files/61005/Secunia-Security-Advisory-27669.html