What You Should Know About a Merge-Purge

Of course, the main reason for running a merge is to identify and eliminate duplicates from your mail file. A merge will identify two types of duplicates: duplicates between files (known as inter-file dupes) and duplicates within a file (or intra-file dupes).

When duplicates are on a file, the merge can assign the surviving record randomly across all lists or based on a defined priority by list. That is, the merge assigns which list retains the record that appears on more than one list.