Oh man Chris, I think I jinxed you on that one (I warned you about the inquiry email surge)... Sorry dude. haha
Don't let it get you down brother. Happens to the best of them.
Instead of dealing with each and every email, which is probably driving you and McKenzie bonkers, how about a generalized update every couple of days/ weekly, saying something like:
" To all our H2 customers, this email is to update you on your pre-order purchases. We have now shipped all pre-orders that were placed before (5/31). We ask that all domestic Customers please allow ( 2-5) business days for delivery. All international customers, please allow (2-4) weeks, depending on customs delays. Please check back again shortly, as we will continue to update all our H2 customers weekly on the shipping status of this pre-order item. If you feel that a problem has occurred with your order please email us accordingly to resolve any issues that you have experienced."
Really depends on how much longer your shipping the pre-orders, and how much you don't want to get inquiry emails during said time frame. This should cut off a majority of the inquiry emails, would give all pre-order customers a better idea (sound mind for the buyer), and save you guys some precious time and money. And unless the email specifically asks for a tracking number, you could copy and paste the message in replies...
Just an idea, from my own experiences in the online sales world, no offense meant. Can't wait till I get the masks in, and remember to relax through the stress! Again, congrats on the Release!