Failed to send Email notification error

I have been running backups both by schedule and manually and when I check the log to make sure everything is ok I notice that I have these warnings along with successful backups that state, "Failed to send Email notification". This would be fine if I had that option checked to send me email notifications, but I never have checked the box that gives that option. Where this comes from I have no idea. I guess what I'm most worried about is that the backups that are being completed successfully are actually good backups even though they come with this error.
I have enclosed a screenshot of my log showing when this started, July 28 and the last one I got was today Aug. 15. Should I just disregard this or what???? Thanks