PayPal with an invoice of $3000.99.

Warning signs:
- Didn't buy anything for that amount.
- E-mail says, at the top, it was already paid ("went through successfully") via my checking account.
- E-mail content in the body says if I don't contact them it "will" be approved; the e-mail is contradictory to itself.
- I don't have my checking account set up with PayPal, I use only my CC instead.
- Checked both my checking account and credit card for a $3000.99 charge and, thankfully, no charge or withdrawal for that amount.
- Legitimate PayPal e-mail receipts come to my inbox, not my junk mail.

All that is pretty obvious, but here's where it gets weird....with the e-mail unopened, when I hover my cursor over the sender's address, it shows a sender address that is actually legitimate ("[email protected]"). That "[email protected]" is the exact same sender for legitimate PayPal purchases I made; I went through other PayPal receipts for purchases I actually did make and they all show a sending address from "[email protected]". What the heck?

Are scammers now able to trick even our PCs/laptops into causing legitimate sending addresses to appear under the cursor when actually they aren't? Anyone else seen this?