* Jacob Fugal [Tue, 27 Jan 2004 at 16:00 -0700]
> I think the likely approach here is in the forwarding. If I understand
> correctly, email sent to [EMAIL PROTECTED] is forwarded iff
> the from address is in a validity list (or hopefully/probably some other
> more sophisticated and stringent check). They could modify that
> forwarding mechanism to forward the email to all students iff the email
> is signed with a valid key. The end recipient doesn't have to know
> anything about the key.

This is exactly what I meant. You wouldn't even have to do much more than
set up the MUA of <person allowed to mail the entire student body> to sign
the email, and that's only for the purpose of getting past the forwarding.
I don't think it would be that hard. If this were something that a lot of
people would be sending mail to, that would be a different story.

p.s. sorry if you get this twice.

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