Mandriva Linux Security Advisory – A denial of service condition was discovered in Sympa versions prior to 5.4 that allowed remote attackers to crash the Sympa daemon via a malformed email message. The updated packages have been patched to correct this issue.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/67998/MDVSA-2008-133.txt
Source: https://packetstormsecurity.com/files/67998/Mandriva-Linux-Security-Advisory-2008-133.html