Would you please weigh this letter to see what the postage is ?   Do you want to send it by ordinary or registered mail ?   By ordinary air mail , please .   Anything of value in it ?   A postal order for four hundred dollars .   In that case , you'd better have it registered .   Will I be informed when my friend gets the letter ?   Yes , when your friend gets it , he'll sign a receipt , which will be sent to you by mail . Then you can be sure it's been received .   All right , I'll have it registered , then . 