URGENT HELP NEEDED! PLEASE OPEN AND TELL ME WHAT YOU THINK..!!!!!!!!!!!!!!?

so i joined this thing called "free lotto" recently on the net and they've sent me 2 emails saying that i've won some cash and lets just say that its over 1 million australian dollars !! the problem is though, i've never used this before and my mum says to delete it because they are all fake but i don't know... it seems a bit convincing... (it shows a lot of other winners from around the world too) but i really dont know if i should claim it and give them my address and stuff but if it were really true, i'd be rich.. so please help if you know anything about free lotto, is it true or fake and should i claim it or not ?! : |