Explain this!

I got this e-mail from Blogger, which is linked to my G-Mail, so I don't know how it sent the notification to my hotmail. 

The e-mail is supposed to tell me when someone comments on my page but for some reason it also sent me a USPS tracking number and not just any number but a number that isn't tracking anything. 

Here is the USPS link: https://tools.usps.com/go/TrackConfirmAction_input

Tracking Number: 04897914129126519008

Tried it...