Can someone tell me how this list with this header got spammed?

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* Notebook= No
* Errors-To= Owner
* Subscription= BY OWNER
* Ack= Yes Confidential= No Notify= No
* Files= No Mail-Via= Distribute Validate= No
* Reply-to= Sender,Respect Review= Private Send= Public
* Stats= Normal,Private X-Tags= Yes
* Default-Options= NoFiles,NoRepro
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Thanks

Anthony