For some reason I have today received this message for an email that I have been receiving regularly (daily) for months (newsletter) from a safe sender..
I have checked the forums and see that others have had this same problem going back as far as 2014. But in all the comments there does not appear to be an answer/solution as to why this is happening, and what can be done to stop these emails being rejected.
Has something been changed in Norton 360?
I am using Windows 10 all upto date with updates.