Frequently getting warnings from 360 of Email Error showing mails I did not send

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1

Hi

Randomly receiving Norton warnings that email I sent was rejected by server and could not be delivered, maybe 10 per day based on no actual mail activity  by me activity by me. None of these are actual emails I have sent. I am using a Dell XPs, Windows 10, every program etc is fully up to date. Regular scanning done, all password in every app etc are auto computer generated, long and using strong combinations.  I use Office 2016 but unlike previous Outlook programs I cannot find individual passwords for each account I have.

I have changed my Microsoft password, changed Gmail password (never used), uninstalled and re-installed Norton 360. Switched off and on Anti Spam function.  Checked Norton history it shows many "High Severities" occurrences for apparently the same error most with different destination emails addresses. Have run Norton Full scan multiple times plus downloaded and ran Microsoft in depth scanner (Ah!! 6 hours to run).  etc 

My concern is that as I do not recognise any of the intended emails at all has  somebody somehow gained access to my outlook mail account and is using it without my knowledge. The only probably OTT thought I had was some time ago at the top of a screen I think I remember somebody advertising to make money out of letting your machine be used. I immediately killed the screen and ignored it, vague and unlikely but maybe worth mentioning. 

Sample history screen attached.

Does this ring any bells??

Steve

2

Do any of the email messages appear in your Sent folder?  I am guessing they don't.  It sounds like someone is spoofing your email address on spam messages they are sending.  If some of the messages turn out to be undeliverable, they get bounced back to you.  Norton actually has nothing to do with this -- it is only displaying the notifications from the servers that are rejecting the messages.  The address spoofing does not require access to your email account and does not mean that your account was necessarily compromised.  Spammers generally abandon spoofed addresses in a short period of time, so you should see an end to this sooner rather than later.