The lyrics are from the point of view of one of two lovers who have had to part ways over the summer. The narrator promises the lover who has had to leave that they will send that worthy their love and dreams in daily letters "sealed with a kiss;" they also bids the other lover pledge, under seal of a kiss, that they will reunite in September.
A third Top 40 Hot 100 version came in 1971, when Bobby Vinton released his interpretation as a single. It reached No. 19 on the Billboard singles chart. This version also placed high on Billboard's adult contemporary chart (#2). Vinton arranged the song himself, with a modern sound including a unique bongo opening that made the song stand out from the pack. The success of the single led to Vinton releasing an album, also titled Sealed With A Kiss, that charted as a best seller. This single, which was a follow up to "Every Day of My Life," marked a Vinton comeback in 1971, with the artist appearing on American Bandstand and other television shows on the strength of the single. Billboard ranked it as the No. 87 song for 1971.
In 1989, Jason Donovan released a cover version as the third single from his debut album, Ten Good Reasons. His version went straight into the UK Singles Chart at number one and stayed there for two weeks, also reaching the top in Finland and Ireland.