Direct Mail - Follow-up on lead that I will not make an offer on?

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Hi Everyone:

I have been receiving some leads in response to my direct mail campaign for vacant land.  As important as it might be to know what a GOOD deal looks like, I would bet dollars to doughnuts that it is just as important to know what a BAD deal looks like.  Frankly, a lot of BAD deals have been coming through my pipeline, but I remain hopeful for the needle in the haystack to finally appear.

My question has to do with best practices for following-up with owners that have properties that I have no intention of buying.  If they contacted me trying to sell their land, but it does not meet my land use/zoning requirements, should I just ignore them?  Or should I send a letter to the landowner letting them know that their property is not what I am looking for and to keep me in mind if they come across any other properties that are closer to my criteria?  The individual I am referring to contacted me via telephone, if that makes any difference. 

I feel like the fact that I received a response from this person is somehow valuable in itself , but I am not sure if the follow-up communication is even worth it or necessary.  

I would love to hear your thoughts.

James