Administrivia: adding List-Id: header?

[jang at ioctl.org]

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.

-- 
Update your address books: jang at ioctl.org  http://ioctl.org/jan/
"No generalised law is without exception." A self-demonstrating axiom.