Email is fairly unreliable for something like this, especially considering the international aspect. I would like to make the humble suggestion that the next ganza be done via a webform linked to a database, temporarily hosted on a server close to an internet backbone with a temporary but extraordinarily high bandwidth allocation. This would also make it a lot easier for the staff to process the orders.
Maybe some flux capacitors and transwarp drive?
Interesting first suggestion, but let's not try to design an online service on a BF thread. Anywho, I like the randomized, wild west aspect of using e-mail for this. The uncertainty is part of the fun!