An open occurs in one of two ways.  When a contact opens a message resulting in displayed images. We are able to detect this by placing a tracking image at the bottom of each HTML message (given that tracking is enabled). When we receive confirmation that the image has been displayed, it confirms that the message has been opened. Additionally, Listrak counts an open when images aren't displayed, yet the contact clicks a link within the message.

A read is a message that has been opened and has been held open for a minimum of 5 seconds.  

Did this answer your question?