Hundreds of spam email "Mail delivery returned" in Plusnet (Thunderbird) inbox

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I am receiving hundreds of spam mail (to me in my Plusnet email address inbox) in Thunderbird. As fast as I delete them more and more arrive - literally hundreds of them:
This is an automatically generated Delivery Status Notification. Delivery to the following recipients failed permanently: * [email protected]
I have put xxx in the name but the emails allegedely come from more than one btinternet.com email address.I have not sent these emails, they are not in my sent box yet they are being returned to me as failed deliveries.
Windows Defender says no threats and I'm beside myself trying to stop these emails. I can't keep up with the number to constantly delete them.
Even as I type just now more and more of these emails constantly arrive in my Plusnet email inbox. I am not exaggerating - I have lost count but hundreds of them.
Any help gratefully appreciated.
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Just create a filter or Rule in Thunderbird to automatically delete these emails.