Dear _________________

Your offer to help us in our campaign to _______________________ (objective) is greatly appreciated. If everyone were to commit themselves with the same level of enthusiasm you expressed in your letter, we would undoubtedly have this problem licked in no time at all.

We are sending you our pamphlets to be distributed to your personnel. This will help us to spread the word while keeping our costs down to a minimum.

Thank you again for your willingness to assist.