( m l &-pend ing) (n.) The process of merging a database of customer information that lacks email addresses for the customers with a third-party’s database of email addresses in an attempt to match the e-mail addresses with the information in the initial database. A typical email appending scenario involves a business that has name, address and telephone data on its customers to do business through mail or over the telephone, but the company wants to expand into e-mail communication and pays a third party that has a database of e-mail addresses in order to merge the data together.
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