Email appending is a practice that involves taking known customer data (first name, last name, and postal address) and matching it against a vendor’s database to obtain email addresses. The purpose is to grow an email subscriber list with the intent of sending customers information via email instead of through traditional mail. Email appending is a controversial practice in the email marketing world. The “Messaging Anti-Abuse Working Group” (M3AAWG) released a position paper stating the practice of email appending is in direct violation of their values as an abusive practice.