Im guessing you are saying the postman likes your smell. Not sure if the postman is male or female but either way if you are getting vibes that he has an interest in you and you are also drawn to him than make the first move. Ask him to lunch after his duties and see where it takes you. Maybe start by offering him refreshments during his rounds to judge his interest in you. Good luck. Sorry I dont do any language but English. I had to google a translation for your question.