I struggle with this too, even just being in Alaska. It is confusing because some companies will air mail items of a certain flashpoint whereas others will not. I have tried to sift through the actual postal regulations to figure out what the rules (and penalties) are, but honestly, I haven't been very successful. I did, however, read that no exceptions exist for the prohibition on international mailing of hazardous materials. I think this is because the only exceptions involve ground shipping, and USPS does not ground (or water/boat) ship internationally.
Another tidbit that may or may not be useful: the USPS explicitly defines perfumes as being hazardous if they contain alcohol. Since FOs aren't labeled for ingredients, I'm not sure whether they contain alcohol or not. But as far as I know, EOs do
not contain alcohol so they may pass the red-faced test easier. Also, I didn't find flashpoints specifically mentioned in the regulations, except in the context of non-perfume like materials (such as pesticides). I must be missing something since this doesn't make sense. Elsewhere (not in the regs), I read that 141 F (60 C) is the magic flashpoint to beat when air shipping perfume like materials via USPS.
The biggest risk that I see in choosing to ship fragrances via USPS is having your package intercepted &/or penalty applied. I don't know how likely they are to let it through in international shipping, but I doubt your action would cause a major accident. You could also check into other shipping companies like FedEx who might offer international hazardous shipping by boat and ground methods rather than solely by air. It is likely to be spendy but if you order enough it might be worth it to you.
The best work-around that I've found is to put fragrances in checked luggage on commercial airlines. This of course requires a traveler/passenger; however, you may still be able to use it to your advantage when you or someone you know travels from the States. You can pack up to 68 fluid ounces (approx. 2 liters). I don't know why they are more relaxed, but here are the FAA rules:
http://www.faa.gov/about/office_org...media/materialscarriedbypassengersandcrew.pdf
Sorry that my input is not very favorable. I wish I had better answers, as they would benefit me, too!