> All true, BUT isn't that more or less a Rube Goldberg?

I have a high a regard for elegance as anyone, but in this case I think the
specific-date maneuver IS reasonably elegant. The setting can be removed
after it's served its purpose, and it is well-adapted to the situation.

That is, providing the list isn't too large. I don't know how many probes,
all triggered at once, is a good idea. What I was contemplating was setting
NORENEW on everyone, then making the transition a little at a time with
    set <listname> renew for a*@*
    set <listname> renew for b*@*
etc. through the alphabet, over the course of a month or so, and counting on
the period of inactivity to cause the probes to be sent to practically
everyone.

Hal Keen