"Virus" dans la messagerie.

Bonjour à tous,

Je reçois du spam avec des courriers du type :

" CNN.com The Daily Top 10
Top 10 stories

Bill Clinton Regrets, 'I Am Not a Racist'
2. "Brangelina" babies finally unveiled on Web
3. Five Secrets to Get a Bargain on a House
4. Bill Clinton Regrets, 'I Am Not a Racist'
5. Key to Biz Success: The Conference Table?
6. "Brangelina" babies finally unveiled on Web
7. In the first surgery of its kind, a German farmer gets a new pair of arms.
8. What Is Microsoft So Afraid Of?
9. Vet Aids Endangered Shark
10. Man wins appeal in bizarre gasoline suicide case



Top 10 videos

Michael Jackson is sued by his own dog
2. In the first surgery of its kind, a German farmer gets a new pair of arms.
3. Facebook Grows, but Where's the Profit?
4. Naked Madonna blows the press conference
5. Maine island loses trash can mail delivery service
6. Russian stocks take hit as govt. looks to nationalize steel, oil companies.
7. Facebook Grows, but Where's the Profit?
8. Edouard Triggers 'Cane Watch for Texas
9. Dinosaurs Come to Life at Exhibit
10. Social networking sites have lots of users, but no one seems to be buying.


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Bref du spam, mais je reçois ce même spam à tous mes mails perso qui sont enregistré dans mon carnet d'adresse....
J'utilise la messagerie Mozilla Thunderbird 2.0.0.16

Et récemment j'ai reçu un message qui me dit que le message que j'ai envoyé n'est pas arrivé .... Or je n'ai jamais envoyé ce message ... de plus l'adresse du mail est juste changé avec quelque voyelle de changée. Voilà le message :

"This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

cthenaisy@interne.jardiland.fr
SMTP error from remote mail server after end of data:
host mail.interne.jardiland.fr [212.180.5.152]:
554 5.1.0 Sender Denied

------ This is a copy of the message, including all the headers. ------

Return-path: <c.thenard@free.fr>
Received: from smarthost195.mail.easynet.fr ([212.180.1.195] helo=smtp4.mail.easynet.fr)
by mailrelay.mail.easynet.fr with esmtp (Exim 4.62)
(envelope-from <c.thenard@free.fr>)
id 1KQMC3-0007iw-Qa
for cthenaisy@interne.jardiland.fr; Tue, 05 Aug 2008 15:03:15 +0200
Received: from [212.180.1.65] (helo=mailhub4.mail.easynet.fr)
by smtp4.mail.easynet.fr with esmtp (Exim 4.63)
(envelope-from <c.thenard@free.fr>)
id 1KQMBw-00028r-4D
for cthenaisy@interne.jardiland.fr; Tue, 05 Aug 2008 15:03:08 +0200
Received: from [212.180.1.57] (helo=mx5.easynet.fr)
by mailhub4.mail.easynet.fr with esmtp (Exim 4.50)
id 1KQMBv-00082F-TY
for c.thenaisy@jardi-enseignes.com; Tue, 05 Aug 2008 15:03:08 +0200
Received: from gip.gip-consultant.com ([193.238.231.19])
by mx5.easynet.fr with esmtp (Exim 4.63)
(envelope-from <c.thenard@free.fr>)
id 1KQMA4-0003D6-4o
for c.thenaisy@jardi-enseignes.com; Tue, 05 Aug 2008 15:03:07 +0200
Received: from MicrosoftCorp (ppp-58-8-112-51.revip2.asianet.co.th [58.8.112.51])
by gip.gip-consultant.com (8.12.11/8.12.11) with SMTP id m75CuB3Q024004
for <c.thenaisy@jardigestion.fr>; Tue, 5 Aug 2008 14:56:12 +0200
Date: Tue, 5 Aug 2008 14:56:11 +0200
Content-Return: allowed
X-Mailer: CME-V12.81.4; MSN
Message-Id: <20080805150058.3252.qmail@MicrosoftCorp>
To: <c.thenaisy@jardigestion.fr>
Subject: Time is pleasure, make it more durable. , c.thenaisy@jardigestion.fr
From: VIAGRA ® Trusted Shop <c.thenaisy@jardigestion.fr>
MIME-Version: 1.0
Content-Type: text/html; charset="UTF-8"
X-MailScanner-Information: Contact your ISP for more information
X-Webcourrier-MailScanner: Not scanned: please contact your Internet E-Mail Service Provider for details
X-AntiVirus-AntiSpam-MailScanner-From: c.thenard@free.fr
Content-Transfer-Encoding: 7bit
X-VR-Score: 12.0

<meta http-equiv="Content-Type" content="text/html; charset="UTF-8">
</head>
<html>
<body>
<table cellpadding=0 cellspacing=0 width=600 align=center>
<tr>
<td class=EC_container bgcolor="#F2F2F2">
<table cellpadding=0 cellspacing=0 width="100%">
<tr>
<td>
Time is pleasure, make it more durable.
<div align=center> <a href="http://pinksapphires.co.uk/images/New Folder/" target="_blank">Click here!</a> </div>
</td>
</tr>

</table>
</body>"


Donc je me demande si ma messagerie n'est pas infecté ! Et si je n'envoie pas des messages moi aussi, "à l'insu de mon plein grès" ????
Comment vérifier cela ?
Merci beaucoup pour votre patience.
C@thy