Quote Originally Posted by Freedom View Post
Anyone got ideas for me please?!!!
If you are sure your PC is not infected, the most likely explanation is someone else who has your email address in their address book has a bug on their PC. Email bugs 'spoof' addresses to make them seem like they are coming from a legit sender. This bug sent a message to a invalid address and the message you shared is the 'bounce' telling you the recipient does not exist.

This said, in my professional opinion, there are better Anti-Virus tools out there than Norton. We resell a product called ESET. It is better than Norton and cheaper.