Please Google and search Postal Monitor for countries that the USA cannot send to and countries that are not shipping to USA which includes Finland and India. All swappers should check their country's postal service to see where they can and cannot send mail to. These can include even postcards and letters. A person in India had their postcards destined for the USA returned to them. They will return if there is a return address so be sure to include return addresses on even your postcards. If no return address I believe they get held in a purgatory (my word lol) until international mail circumstances change.