<A target="_blank" href="http://www.curiousmitch.com/CuriousMitch/mitch2.nsf/d6plinks/MCON-86MHA3">Mitch Cohen's server was running 8.5.1 FP2 when it started having problems with SMTP routing</A>. So he started reading fix lists. Then he found an interesting oversight that you'll want to know about.