http://www.robotigers.org/HowItWorks3.htm
explanation
http://216.239.51.100/search?q=cache:FmncYXnNIK4J:satcom.nic.in/dns.htm+dns+mx+record+tutorial&hl=en&ie=UT F-8
cached version of a detailed DNS tutorial (should help you with your workaround)
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