I did some investigation myself. It appears like ListServ is formatting
mail-headers:

Date:         Mon, 17 Sep 2001 20:22:21 +0200
Reply-To:     My Discussion list <[log in to unmask]>
Sender:       My Discussion list <[log in to unmask]>
From:         Frank Laurijssens <[log in to unmask]>
Subject:      Re: [LSTSRV-L] Exchange 2000 putting 2 spaces before every
              Listserve Subject line? 
To:           [log in to unmask]

RFC 822 sections 3.1.2 and 3.1.3 do not clearly state whether whitespace
between Subject: and the field body (which is unstructured in the case
of the Subject field) has to be disregarded or that it belongs to the
field body. Microsoft apparently decided that it should belong to the
field body, whereas LSoft obviously decided that it is just
linear-white-space. This is where the spaces are coming from.
The whitespace in the middle of the subject (between 'every' and
'Listserve' in the subject of this message for instance) is a bug on the
Exchange side, it does not 'unfold' the Subject-field correctly.

Anyway, I cannot seem to get any information on this from Microsoft, but
in the meantime I started wondering why this formatting is done by
ListServ. At the moment, I do not see any benefits in it. Can anyone
shed a light on this?

FrankL





> -----Oorspronkelijk bericht-----
> Van: Frank Laurijssens 
> Verzonden: zondag 16 september 2001 19:50
> Aan: [log in to unmask]
> Onderwerp: Re: [LSTSRV-L] Exchange 2000 putting 2 spaces before every
> Listserve Subject line?
> 
> 
> It has been a while since this message was posted, but I noticed this
> problem too and I could not find an answer yet. Does anyone 
> know how to
> solve this?
> 
> FrankL
> 
> 
> On Wed, 9 May 2001 09:41:52 -0700, Ahern Ikeda, Shannon
> <[log in to unmask]> wrote:
> 
> >We recently upgraded to Exchange 2000, and it is doing something very
> >weird to our listserve mail. Not only the lists we host, but 
> to mail I
> >am getting from other listserv lists. It is putting 2 or so spaces in
> >front of the subject line of messages that come via listserv.
> >
> >Anyone have any ideas? It is breaking people's mail rules, and I am
> >getting a lot of complaints.
> >
> >TIA for any advice,
> >
> >Shannon
> >~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >Shannon Ahern Ikeda
> >DevelopMentor WebMistress
> >310-543-1716
> >~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >"Sometimes when I consider what tremendous consequences come 
> from little
> >things . . . I am tempted to think there are no little things."
> >  - Bruce Barton
> 
>