The day, which is believed to have originated in Japan, aims to encourage people to take up the almost lost skill of writing letters to friends, family and loved ones. To mark this red letter day, here are 10 tracks about letter writing.
Message in a Bottle
Taken from the band's 1979 album Reggatta de Blanc, this track was the group's first UK number one. The song, which debuted on the Rock Goes to College show, is Sting's favourite Police track.
Nick Cave & the Bad Seeds
This track is taken from the band's eleventh album, No More Shall We Part. The album marked the end of a four year recording gap by the band and showcases the virtuoso talents of the group.
Writing to Reach You
The first single to be taken from the band's second album The Man Who, this track was inspired by the Oasis song Wonderwall. It even includes the line 'and what's a wonderwall, anyway?'.
Air Mail Special
Written by Charlie Christian, Benny Goodman and Jimmy Mundy, this track appeared on Fitzgerald's 1957 live album with Billie Holiday. It was recorded at Newport Jazz Festival and includes a scat solo.
Signed, Sealed, Delivered (I'm Yours)
Released in 1970, this track spent six weeks at number one in the US R&B chart. The song was the first single to be produced by Wonder and the first to feature his female backing group.
Pen and Paper
Jerry Lee Lewis
Written by Diane Kilroy and Eddie Kilroy, this track was the b-side to Lewis's version of Hit the Road Jack by Percy Mayfield. It was released in 1963.
Lost in the Post
This track is taken from the British indie band's debut 2007 album A Guide to Love, Loss & Desperation. The album included the hit singles Kill the Director and Let's Dance to Joy Division.
Released as a single from her 2010 debut album Lights, Goulding says this track is "about how you'd do anything and change absolutely everything about yourself" to be noticed by one person.
Mailman Bring Me No More Blues
This track appeared on Holly's self-titled second album in 1958. It contains one of his best known songs, Peggy Sue. A year after the album was released Holly was killed in a plane crash.
Please Mr Postman
Released as the group's debut single in 1961, this was the first Motown track to reach number one in the US Billboard chart. It reached number one again in 1975 when it was covered by the Carpenters.