I use one first class stamp for the USA 4 coin flips in a envelope Canada and Europe one international stamp same thing
Never had a letter returned,use my real address as well,just put them in the mailbox not the post office
I use one first class stamp for the USA 4 coin flips in a envelope Canada and Europe one international stamp same thing
Never had a letter returned,use my real address as well,just put them in the mailbox not the post office