Increase in Delivery Status Notification (Failure) messages in email Inbox

I've started getting lots of emails headed "Delivery Status Notification (Failure)".

The body of the email includes the words "this is an automatically generated Delivery Status Notification" and then there's the email (some sort of spam message).

Does this mean my computer has a trojan and is sending out emails, some of which are bouncing back as unsent, or is this just spam?

I run Kaspersky Internet Security and have scanned my machine. Kaspersky tells me my computer does not have a trojan or a virus. I have also run malware bytes - also says I'm clean.
richo22Asked:
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zulumikeConnect With a Mentor Commented:
It's probably outside your machine. It has sort of "stolen" your email-address, which is easier than stealing candy from a baby :-)
It's not much you can do.
most likely this problem will come and go from time to time.
If the problem gets really bad you should just get a new email-adress.
And be careful not to give up your email-adress everywhere.
I have several email-adresses. And one of them is just a hotmail adress I use for registering to different forums etc. where i suspect my email-adress may be mis-used.
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zulumikeCommented:
Most likely it's someone else (spam-robot) that is using your email-adress to "send from".
And when servers are replying with a ndr its you that gets the mail, instead of the real sender.
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richo22Author Commented:
Thanks for getting back to me so quickly.

Does that mean the spam-robot is operating from inside my machine, or is it likely to be operating from somewhere else? (Given that Kaspersky has given my machine a clean bill of health).

If it's completely outside my machine, is there anything I can do so that my email address is not being used by a spam-robot?

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richo22Author Commented:
OK. Thanks for your help.
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zulumikeCommented:
Thanks for the points. :-)
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