Question: Have you ever? Had someone that at one time where involed with a very long time ago, out of the blue send you a letter just to say hi and to see how you are doing? should you responed to the letter or ignore it? why or why not?

Answer: Yes, and depending on the situation of how you became uninvolved, respond politely.  If it was a good thing and you care, then respond.\nMaybe this person is fishing for information to see if you are single.
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