First the letter was sent via the “Peterspost” private company from the “Finlandia-2017” FEPA exhibition in Tampere to Moscow. Then the letter was delivered to the ISS by the Russian "Soyuz MS-05” spacecraft. To document the delivery, on board the station the letter was marked with all proper board seals including the Russian official “Russian Post. ISS. Russian Segment” round board post mark dated July 29, 2017, the day when the “Soyuz MS-05” spacecraft docked with the ISS.