The Russian "Soyuz MS-04” delivered to Earth several letters.
This letter was written by Russian cosmonaut Sergey Ryazansky and addressed to Sergey Rodin (Monaco delegate at the FIP Section for Astrophilately). Aboard the International Space Station, the letter was marked with the following seals: the “Russian Post. Board of ISS. Russian Segment” round board post mark and the “Russian Segment of International Space Station” board souvenir seal both dated September 3, 2017, the day when the Russian Soyuz MS-04 spacecraft undocked from the ISS, as well as with the “ISS” octagonal board souvenir seal. Some material delivered to Earth by "Soyuz MS-04" were delayed by the "Energy" corporation due to operational reason during about one month and a half after the landing of "Soyuz MS-04". After the letter had been released by the "Energy" corporation, on October 24 it went via registered mail at the Post Office of Zvyozdny Gorodok to the addressee.