Are PCH Lottery or UK National Lottery 's prizes real?

I received mails from PCH Lottery and UK National Lottery informed me that I have won 560000 pounds .Then I replied and the mails I received seemed to be reliable.How about the Universial Air Courier?Are they honest?They gave me an email informed me that the UK National Lottery have sent the package for them and it's going to be sent.Reply me a.s.a.p