what does it means:australian lottery inc.?

Answer 1

If you got an email saying you've won it, it's a scam, you didn't really win anything, so just delete it. If you reply they'll either ask you for a lot of personal info that would let them steal your identity, or more likely tell you that you need to send a "delivery fee" or some other fee to get your prize, then if you send it you'll be scammed out of that money. There is no prize.