Url looks suss. Seems kinda sophisticated for the usual ups fishing scam. Here’s the text message I got leading here.
“Wishing you a bright and sunny day!” Lol, I almost want to help this guy by explaining that UPS and American companies in general have disdain for their customers and would never wish them to have anything that would not benefit the company.
You got several good answers already.
First of all, if you aren’t expecting any shipment from USPS, then why would you be updating your address details for them at all?
But even if you are: gflmr.cyou is certainly not the USPS and I highly doubt they would have errors like “package number number” and weird grammar like “because … is not clear, your package is not delivered” on their tracking website.