How do I remove duplicate emails from a saved search?

The nature of our business is such that the same contact in our system could be associated with multiple customers/companies, all under the same parent organization. These companies have unique ID's. So, when I create a contact based saved search in an effort to send out an email campaign to our contact base, the same email is coming up several different times, as it is associated with different accounts. These contacts all have different internal ID's. I can't seem to figure out how to filter out duplicate emails from the saved search, so that the same email isn't sent 5,