"In Your Letter" is a song written by Gary Richrath that was first released on REO Speedwagon's 1980 album Hi Infidelity.

It was released as the fourth single from the album and just made the Top 20 on the Billboard Hot 100 chart, peaking at #20.

"[2] Casandra Armour of vintagerock.com says that lyrics contain "cutting accusations with cruel alliteration like 'But you hid behind your poison pen and his pride' and 'You could have left him only for an evening let him be lonely.

'"[5] Cronin has stated that the original version of the song very simple, very almost like ‘50s doo-wop melody and chord structure.

"[3] Gerald Martineez described the song as "an uptempo tune about an angry lover complaining of the way he was dumped.

"[5] Hawkins also noted a stylistic similarity with the Pointer Sisters' song "Should I Do It" from their 1981 Black & White album.

[6] Upon Richrath's death in 2015, Guitar Aficionado included "In Your Letter" as one of his top 10 finest moments with the band.