David over at NetEndeavors said he'd be able to set up a dev server for us late this weekend / early next week -- thanks for hooking this up SysKoll!!!!
We'll have a lot more flexibility since we'll be able to tinker with sendmail (or the MTA of our choice) at will, and we'll insulate production from careless mistakes [that I make ].
I'll be in touch as soon as we get the info.