A relatively common bug parsing TXT records delivered over DNS, dating at least back to 2002 in Sendmail 8.2.0 and almost certainly much earlier, has been found in LibSPF2, a library frequently use...
-</p>
Make your website safer. Use external penetration testing service. First report ready in one hour!</p>
http://www.securiteam.com/unixfocus/6N0020KN6U.html