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@ eric
Macs got haxor'd is just about exactly what this looks like.
They should be on MS's Exchange email system. It has patented user credential authentication built in which actually does prevent spoofing an internal email addy. That also prevents accessing internal mailing lists like "all employees".
Flame on fanbois. I'm waiting to hear how much better apple systems are than MS's enterprise wares, which should be interesting considering this gaping hole.