[MM3-users] Getting original message headers

We've been seeing some particularly pernicious spammers recently. They're using gmail accounts; I'd like to report them to Google.

To do that I need to find the original message headers. By the time the message gets to the archive, or to the mailing list recipients, all the Received: headers seem to have been deleted, leaving only the ones from my list server outwards.

Is there a way to access the original incoming emai, before DMARC mitigation etc., has changed the headers?

Peter C