 Email appending is a controversial practice in the email marketing world, with critics claiming that sending email to people who never explicitly opted-in is against best practices.An email appending process involves either a business or consumer database made up of contacts including their name, address and company name [for business contacts].If the company wants to expand into email communication, then they can involve a service provider that has a database of email addresses in order to merge the data and append business or consumer email addresses to their existing file.