Just to echo a note from Greg (guessing Greg Taylor from the Exchange team?) on that CU2 blog entry regarding a change in those annoying [to me at least] health/probe messages:
Just for heads up…
With CU2 inboundproxyprobe has new TLD in place: contoso.com
You may want to correct your bypassed senders to: firstname.lastname@example.org to avoid tons of spam from probe engine.
Guessing as they didn’t seem to own inboundproxy.com, this makes some sense – but from the world of training manuals and examples into production? Contoso.com’s MX records point at Microsoft Exchange Hosted Services (was Frontbridge – is that now FOPE?)
You may want to add TailspinToys.com to bypassed senders as well for futureproofing :-p