Rechercher une adresse ip dans un mail

Bonjour, je suis harcelé par une personne qui m'envoie des mails puls que douteux, je n'arrive pas a savoir qui est cette personne.
C'est une adresse professionnel que je ne peux changer
Si il y a quequ'un qui puisse m'aider a dechiffre
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Return-Path: <jo.gue@laposte.net>
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Message-Id: <1B4B6883-8FF0-4AF4-B5F6-676A34D7D5E3@laposte.net>
From: jo.gue@laposte.net
To: marie@afleurdesoi.fr
Content-Type: text/plain; charset=ISO-8859-1; format=flowed; delsp=yes
Content-Transfer-Encoding: quoted-printable
Mime-Version: 1.0 (Apple Message framework v936)
Subject: Client satisfait !!!!
Date: Wed, 9 Dec 2009 12:25:20 +0100
X-Mailer: Apple Mail (2.936)
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pour que je puisse m'expliquer avec lui (verbalement )
Merci