I use myus to buy things in the US to be shipped via USPS to France. MyUs is pretending to propose USPS services in their website (« about us » page notably). I find out that this is a lie as USPS is not an option at least for France. The issue is that unlike USPS, other carriers go proactively to custom authorities to collect taxes and custom duties. That is not the case with USPS. I bought many things with this in mind and now I am screwed as there is no way to know that USPS is not an option until you buy something. Totally screwed
We actually do offer USPS as a service for select countries. We do have that listed on our website.