Awesome, though I wouldn't have chosen to host it in Walnut, California. Pretty sure this will be a target for lawyers soon.
It's being announced by Amazon, has nearly 100k other domains associated with it [0] and a <3ms ping for me in Europe so I think this is just CloudFront.
Speaking of, I highly recommend virtualpostmail. I've used them as my personal mailing address for years now. I did a USPS change of address once, and now any time I move, I no longer have to update my address with anyone. Also, I get PDFs of my letters in my inbox, and can reship them to wherever I happen to be that week, even if I'm away from home.
Extra protip - I’d you’re traveling, they can ship to any FedEx office store and “hold for pickup” and most full-service hotels will receive packages for you, even a day or two in advance.