I often write about the cyber security risk of Android apps – this is not an app issue but a iMessage phishing (smishing!) attack.
USPS Phishing Scam Targeting iOS Users – SANS Internet Storm Center
If the message was opened on a Mac, the anti-phishing protection redirects to the legitimate USPS site, but on an iPhone it takes you the phishing site. The post by Johannes Ullrich shows you the detailed screens of the attack.
Your takeaway – iPhones and iOS devices may benefit from the app protection provided by the “walled garden” Apple App Store but they are still open to other attacks.
Clive Catton MSc (Cyber Security) – by-line and other articles