to something like:
From: Brian E Carpenter
<brian(_dot_)e(_dot_)carpenter(_at_)yahoo(_dot_)com.INVALID>
That's what I do on my lists. It was pretty easy to add in the shim
that adds the outgoing DKIM signature, and is the least painful thing
I could think of for my mostly non-technical users.
(or maybe instead of yahoo.com.INVALID, it should be
"yahoo.com.BREAKS.MAILING.LISTS"
Now, now, there's no LISTS TLD. Yet.
R's,
John