>> Would it be possible to prefix the Subject with something like
>> [TechEmbedBSD] so the the Subject line reads as follows?

Yes, of course that's possible.  (How much work would it be?  I don't
know; I don't know anything significant about the NetBSD lists.  Quite
possibly, more work than the listadmin(s) want(s) to put in.)

> Such configuration makes verification of DKIM signature (and
> DomainKey Signature) fail.  So, anti-spam measures which use DKIM
> signature won't work with it.

Only if the DKIM signature covers the Subject:.  While I'm not all that
familiar with DKIM, I think it has fairly fine-grained control of what
it signs over.

But the same information is trivially - and more accurately - available
in the envelope-from.  (Yes, there doubtless is filtering software in
existence that can filter on Subject: but not envelope-from.  This is a
reason to get better filtering software, not a reason to damage the
list for everyone just to deal with one subscriber's choice of
inadequate filtering software.)

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