I'd use this word. Of course, I'd actually need someone to correspond with via written letters first. And even if I had such a person, I wouldn't be able to keep it up. I used to correspond with a number of people, but no longer. Sad, really; it was so enjoyable.
abbrev. of AFFECTIONATELY adv., used in the subscription of letters. Now rare.
Listening to: Leo Kottke - A Shout Toward Noon - 04 - Easter Again