When I was a clerk I received a huge amount of correspondence, much of which was not relevant to the work of the council! I'd deal with whatever I could deal with directly (reporting potholes for example), add an agenda item about anything that needed a decision by council, note some in an "information only" item where relevant and bin the rest. Sometimes you have to rely on the experience of the Clerk to avoid being inundated with dross but I guess it depends upon the experience of the Clerk.