You are probably right:
LOVE LETTERS(Edward Hayman - Victor Young)
(Elvis re-recorded it for the LP) Written for a 1945 Paramount film,"Love Letters". Dick Haymes(#11 on Hot 100) in 1945. Ketty Lester's 1962 recording hit the charts(#2 on R&B,#5 on Hot 100).Elvis covered Kitty Lester's version.
http://www.biwa.ne.jp/~presley/uscd/cd-ll.htm
Dick Haymes had the original waxing of ?Love Letters? in 1945, the same year as the release of the film ?Love Letters,? starring Jennifer Jones, Joseph Cotton and Ann Richards.
http://www.jerryosborne.com/4-19-99.htm