The Love Letter (1998)

Scotty Corrigan buys an antique desk and finds a Civil War-era letter inside it, written by a woman who died over a hundred years ago. Fancifully, he writes and mails a reply...only to have it reach its destination in the past. As Elizabeth and Scotty continue their remarkable correspondence, they find themselves falling in love, and more than restless about their impending, respective, marriages.