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[Jon Ribbens]

On Wed, Mar 28, 2012 at 01:16:41PM +0100, Chris Salter wrote:
> SAUCE is a 'anti-spam SMTP mail filter'.
> http://savannah.gnu.org/projects/sauce
>
> I'm not an expert in analysing headers but my initial assumption would  
> be that it 'belongs' to the recipients network service rather than yours  
> i.e. Virgin. I started to research greenend.org.uk but hit Tucows so  
> decided to call it a day! :-)

chiark.greenend.org.uk is the server that hosts this mailing list.
SAUCE is the custom anti-spam system that is running on chiark.