Each line shows the Action eye icon, Send By (the user who triggered the message, blank for messages ARM sent on its own), the Date Sent with the time, the recipient's Email Address, the View Count, View Date and View IP Address (how many times the message has been opened, when it was last opened and from which internet address, tracked by a tiny image in the message, so a recipient whose mail program blocks images shows no view), the Subject, the Status (Success or Fail), the Type (smtp when sent through the store's mail server settings, mail when sent by the web server) and the ARM Section, the feature that sent it, such as Send Email - Digital Inspection Customer Approval Initials or Vital Statistics Report. Newest messages are listed first.
The Add To Favorites switch beside the heading saves the report under Favorites on the Reports page. The report is shown only in stores where e-mail sending is enabled. Which reports you see depends on your admin group permissions.