No you cannot use US stamps. Items mailed must have the stamps of the country of origin on them. Most shops will be able to provide you with the appropriate stamps to use to mail with their cards, or visit their post office!
No. When mailing items you use the stamps of the country of origin.
No, you must use US postage stamps.
If you are sending a three paged letter it is around three US stamps!!!!
No. US stamps are good for the U.S. postal service only.
You use the stamps from the country of origin. So if you are mailing a letter from the US to Australia, you use US postage.
No, you have to use stamps from the country of origin of the mail. In this case you will have to use Italian postage stamps.
yes
Yes.
ofcourse they do
No, you should only use US stamps for mail posted in the US.
No.