In the picture, it is signed "Yaeka" (this is from Kumichou Musume to Sewagakari) who is the author of the letter. The translation says "Love, Yaeka" but I'm pretty sure Yori doesn't mean love, and I can't find any part of the letter that has that meaning, so I think it is a cultural translation.
How is Yori being used where it says Yaeka yori?
Is Yori typically used in letters?