Administrivia: adding List-Id: header?

[jang@xxxxxxxxx]

We have -Post, -Subscribe, -Owner, -Unsubscribe, but messages are coming 
out without a List-Id: header.

Would it be possible to tweak the mailing list config to add this please?

Cheers,
jan

PS. Currently using gmail for this; it can filter on that header but not 
on arbitrary headers, it seems.

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