Enough to cover the postage of the letter; one usually does the job. US domestic stamps may not be valid for postage outside the US; check with your local post office, or the Postal Service home page, for information on foreign postage.
One must take the to-be mailed item to a post-office for its weight - it is the weight of an item that will determine the postage (or the amount of stamps to be placed). What does one do, if they have a scale and wishes to avoid going to the post office?
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!
You must use English/British stamps if you are posting from England or other parts of Britain
How much is first class postage from US to Poland?
The number of stamps must equal the amount of postage. The postage depends on the weight and and form of transport.
No, you must use US postage stamps.
Only if mailed from England to the US. You can't mail in the US using a foreign stamp, but must have US postage.
You can use forever stamps on the letter. It is worth 44 cents toward the cost. You must put additional postage on the envelope.
Here is a site that has the information you are looking for http://www.prometric.com/NR/rdonlyres/ebi7ryy5oknk74imu7ruk4wofnfjen674endyxp554t446wg64ryi4poz4353lkseom4jikujqlr2zdg4xrrksinzjc/ARCNABulletin20060208.pdf
No. You must use the stamps from the country of origin of the letter or parcel.
A regular letter to the Ukraine needs to be sent as First Class Mail - International and will require International Rate Stamps. You can not use regular US stamps, you must purchase and use International Rate Stamps.The number of stamps will depend on the weight of the letter. A 1 ounce letter will cost $1.15 (as of April 2015). A 2 ounce letter will cost $2.14, 3 ounces costs $3.12, and 3.5 ounces costs $4.11.
A regular envelope cost $1.89 to send to Mexico.