On 19 Aug 2016, at 10:39, Jim Popovitch wrote:

PRVS/BATV

How is that relevant to this issue?

BATV only applies to the envelope sender address, which any proper mailing list (including any Mailman list) completely replaces with its own bounce address so that bounces go to the mailing list software and not to the original sender or the list itself. As the OP said, this is someone or something spamming the original message authors (as shown in From headers) with the same Subject header as something they've posted to a list.
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