Images specified through <img> tag are embedded in the HTML e-mail template with a unique content-ID. Images can be referred using a relative path like <IMG SRC="images/flower.jpg">, a file URL like <IMG SRC="file:///c:/htmlemails/images/flower.jpg"> or the http protocol like <IMG SRC="http://www.sender-company.com/images/flower.jpg">. An image referred to by the http protocol is not embedded in the e-mail. When images are referred by relative path, or file URL, the SendHtmlEmail method reads the image file’s binary content and adds it to the e-mail container. It creates a new MimeBodyPart for each image.
