Ok i have a iguana coming in the mail and if no 1 is here to receive it what will happen to the iguana?

All breeders and dealers who ship live reptiles require someone to be home in order to honor the live arrival guarantee. So if the iguana dies, you're out the money. They might leave the package outside your door, but usually they leave a note and you have to pick it up. It was poor planning on your part to not make arrangements to be home when the package arrives. Hopefully the iguana will still be alive when you get it.