ITA with mmsc, from what I understand the ONLY way to get tracking from the US to another country is to use global priority express, NOT global priority. You'll need to fill out a customs form in addition to the mailing label for each package. Other than that, it's just like mailing any other package.
I'm actually shipping a package to the Netherlands tomorrow, so you're not alone!
i am in Europe and usually ask sellers to use the priority but i wanted to be even safer and asked to use global express when one of my HGs was shipped to me and paid double of the usual amount i pay for shipping...USPS used fedex to send it, i am out of my money and out of the bag and the tracking website shows that my bag was delivered in Dublin, 300 km from where i live ...i will NEVER request to use global express again id rather not have the minute by minute tracking and get my parcel without trouble.