How do I get the mail?

Hint 1 of 6:

The man inside looks a bit odd, doesn't he?

Hint 2 of 6:

Listen to what he has to say.

Hint 3 of 6:

If you give him something, he'll leave you alone.

Hint 4 of 6:

Make sure you got the leaflet from your mailbox.

Hint 5 of 6:

Take off the stamp.