ofcourse they do
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.
No. When mailing items you use the stamps of the country of origin.
No, you must use US postage stamps.
That is what stamps are for, to pay postage. In the US you buy postage stamps and put them on mail to any other country in the world.
i have sent a letter to the UK, and it takes 2 stamps.
No.
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.
Yes, you can use old 80-cent international stamps from the US to send mail to the UK, provided the total postage meets current rates for international mail. However, it's important to check if the stamps are still valid and if additional postage is required due to price changes since the stamps were issued. Always verify with the United States Postal Service (USPS) for the latest guidelines.
US Postal Service first class postage would be $3.96 ... see Related Link for more details.
US postage stamps do not expire -- they are always worth face value as postage.
You can order them straight from the Royal Mail in the UK and they will post direct to you. Visit the link. If you are looking for older stamps from the UK, then a local stamp shop should have them for sale.
Not in the United States. The US Postal Service approves the postage stamps.