The term SPAM SOURCE can be broken down into three parts: Hormel (6 letters), Email (5 letters), and Emailer (7 letters). Hormel is a company that produces processed meat products, such as Spam. Email is an electronic communication system that allows users to send messages to each other over the internet. An emailer is a person or program that sends emails. Therefore, the term SPAM SOURCE can be interpreted as the origin of spam emails, which are typically sent by an emailer using a service like Email.