It actually says it in your header:
List-Unsubscribe:
<http://mailman.ds9a.nl/mailman/listinfo/lartc>,<mailto:lartc-request@mailman.ds9a.nl?subject=unsubscribe>
Using the mail just make sure u put the right subject unsubscribe
>Dear Sir/Madam
am not sure we have too many madams'' or someone correct me otherwise...
>Please unsubscribe me from your mailing list,
>Regards,
>
>
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