And look on the
USPS website to see
when the '
lil' green customs sticker form' is required (ie for which size of envelope). Then you're good to go! A stamp is a stamp - it's the value of it that's important. Sometimes when I'm sending something overseas I ask for 'regular' stamps as opposed to the printed one. ;)
Um, I just looked on the USPS website - call your local post office and ask. If you're just sending a regular letter or card - no problem! No form needed. Not sure when it is required. And if you do need one - *please mark Gift* so the recipient doesn't have to pay duty.