Thanks, Angel. That earlier thread did help. It was especially interesting because I recently sent a letter to a girl with "Fondly" as the closing. It never occurred to me that I might be complicating her life.
I am still looking for alternate closing messages for my response to the girl who sent me a letter with "Una caro abbraccio" as the closing. Please help me find something different but with the same general tone. I was going to use "Fondly" until I discovered that it may be misunderstood.