An email message that includes a video file, either inserted into the message body, accessible through a hotlink to a Web site or accompanying it in an attachment (least desirable because many ISPs block executable attachments to avoid viruses).
A type of marketing that is carried out voluntarily by a company's customers. It is often referred to as word-of-mouth advertising. E-mail has made this type of marketing very prevalent. The aim of such campaigns is to motivate recipients to forward the message on to their contacts.