Of course
That is the purpose of postage, to allow you to mail letters to anywhere in the world. The stamps of the country of origin of the mail are used for 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.
10 cents toward postage if you use it on a letter mailed in Bermuda. Otherwise, less.
As postage to mail something like a letter.
The entire purpose of the Forever Stamps was that you can use them for one ounce of First Class Postage forever. No additional postage is necessary.
Yes, as long as the total postage affixed equals the current postage rate.
To mail a single letter to Canada, the stamp must be equivalent to the postage cost. As long as the stamp is equal to the postage, any letter can be sent with any kind of postage stamp.
You cannot use the Forever Stamps on foreign postage. The international agreement indicates that value must be shown on stamps used for international mail. The current cost for up to one ounce is 98 cents.
You can use regular postage stamps, but it will cost more to mail a letter outside the US. The cost to mail something from USA to England depends on what you are trying to mail. It costs $1.10 for a one-ounce letter. See related links for Postage Price Calculator to see what it would cost to mail other size items and packages.
They are still valid for use as postage as long as they add up to the proper postage. If you check USPS regulations Postage due, special delivery and certified mail stamps are NOT valid as payment for postage.
Nope, or maybe yes.... I have no Idea
No, Forever stamps cannot be used for Media Mail. Media Mail rates are specific and must be paid with the appropriate postage for that service.