With the normal uptick in deliveries during the holidays, the U.S. Postal Service warns about a scam called "Smishing."
From the U.S. Postal Service:
Have you received unsolicited mobile text messages with an unfamiliar or strange web link that indicates a USPS delivery requires a response from you?
If you never signed up for a USPS tracking request for a specific package, then don’t click the link! This type of text message is a scam called "smishing."
You can read much more about this HERE