The process of removing identical entries from two or more data sets such as mailing lists. AKA merge/purge. Delivered email:  Number of emails sent minus the number of bounces and filtered messages. A highly inexact number because not all receiving ISPs report accurately on which email didn’t go through and why not.
Building and managing an opt in list for a website
Building and managing an opt in list for a website provides a seller direct access to a wide number of potential customers. Building and managing