Both of these mean that you will contact him in the future. The first is a general statement that you will from time to time contact him in future. The second suggests that you will contact him again as a follow-up to this letter.
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kouroshhDear Blue Jay. Can I ask why in your previous message before future you didn't use (a or the)? Can I also ask, why in the (Back to the Future) sentence we use the before future?When talking about the future in general, we usually include the, as I just did.