http://nvd.nist.gov/nvd.cfm?cvename=CVE-2007-0884 "Buffer overflow in Roaring Penguin MIMEDefang 2.59 and 2.60 allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via unspecified vectors." All FE releases are currently at 2.58 - it is unclear to me if that's affected. 2.61 is available in any case.
"Please note that versions 2.58 and earlier do NOT have the vulnerability." (from http://lists.roaringpenguin.com/pipermail/mimedefang/2007-February/ 032011.html) - I'll update mimedefang anyway to 2.61.
27596 (mimedefang): Build on target fedora-development-extras succeeded. 27600 (mimedefang): Build on target fedora-6-extras succeeded. 27599 (mimedefang): Build on target fedora-5-extras succeeded. Building mimedefang for EPEL isn't possible yet as a build requirement package is missing - but checked in the update there, too.