E-mail address Appending

Email address appending merges a database of email addresses with an existing marketer's database to add email as an additional means of contact to the latter database. The database of email addresses usually is from a third party opt-in email marketing service, but it can also be an in-house list of newsletter subscribers. Because the subscribers to the opt-in list have not given explicit permission to the marketer whose database their email addresses are appended to, messages may be conceived as spam.