Please do NOT open emails like that! I kept getting them supposedly from UPS, which sounded logical, because some of the shops do send by UPS. I sent it unopened to UPS, and they said it was not theirs, that they do not do things that way. And they NEVER ask for particulars in an email.
But to be sure, you can right click on the sender's name and then click on "View message source". If somewhere in all the gibberish that pops up you don't see a familiar address or name, then delete it without opening. Better safe than sorry.