Email subject line

Norton Security | Norton Internet Security
1

Many of my emails keep coming in with the following two words:  [Norton AntiSpam] in the subject line preceding the subject.  I have been deleting them not knowing why this is there.  Please advise.  Thank you.

2

Many of my emails keep coming in with the following two words:  [Norton AntiSpam] in the subject line preceding the subject.  I have been deleting them not knowing why this is there.  Please advise.  Thank you.