Liechtensteinische Post AG (German pronunciation:[ˌlɪçtn̩ʃtaɪnɪʃəˈpɔst], lit.'Liechtenstein Post') is the postal service of the Principality of Liechtenstein since 2000. Prior to that, postal service of the principality was managed by Swiss Post from 1 February 1921 until 31 December 1999 upon the signing of a postal treaty signed between the Swiss Confederation and Liechtenstein on 10 November 1920 as part of the customs union between the two states.