I got one yesterday.  Don't know who he is.

On Sunday 06 October 2002 06:27 am, Stephan Rudlof wrote:
> Dear All,
>
> I have gotten multiple 'Mail delivery failed: returning message to
> sender' regarding root at bigpond.net.au for mails to the list. But I
> know they *have* reached the list.
>
> Has anyone seen a similar effect?
> Does anyone know root at bigpond.net.au?
>
>
> Greetings,
>
> Stephan
>
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> A message that you sent could not be delivered to one or more of
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>
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>     (generated from root at localhost)
>     SMTP error from remote mailer after RCPT
> TO:<root at bigpond.net.au>: host pop-server.bigpond.net.au
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>
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> 06:50:08 +0200 Message-ID: <3D9A7B00.6050403 at evolgo.de>
> From: Stephan Rudlof <sr at evolgo.de>
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> To: squeak-dev at lists.squeakfoundation.org
> Subject: Re: [ENH] converse-raok
> References: <200209300356.g8U3ubPB452811 at atlas.otago.ac.nz>
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> Wed, 02 Oct 2002 06:50:08 +0200
>
> Richard,
>
> after taking a short look at the code:
> BinaryBlockConverse>>fixTemps should be added to the changeset,
> since it is called by SortedCollection>>sortBlock:.
>
> Greetings,
>
> Stephan
>
> ok at cs.otago.ac.nz wrote:
> > from preamble:
> >
> > "Change Set:		converse-raok
> > Date:
>
> 	30 September 2002
>
> > Author:
>
> 	Richard A. O'Keefe
>
> > There are applications, like reserving a sorted collection,
> > or sorting in reverse order, but not limited to those,
> > where we would like to take the converse of a predicate.
> > The converse of a function f : (x, y) -> z is a function
> > converse(f) : (y, x) -> z.
> >
> > This change set adds a class BinaryBlockConverse and methods
> > so that aBlock converse value: x value: y = aBlock value: y
> > value: x."!