Since the subject mentions a "COLLECTION," it may be a "sextortion" or "credential leak" scam where hackers claim to have a collection of your private data to scare you into paying a ransom.
The "Zip" extension combined with a string of random characters and "COLLECTION" is a common format for .
If you are looking for a way to respond or handle this, here is a helpful guide on how to proceed safely: 1. Do Not Open the Attachment