Email being falsely rejected as spam when using Image in Outlook signature

Hi Experts,

I have a problem that is causing some issues. Recently some emails have not been delivered to clients because the email has been classified as spam. The signature on the email contains a 36k jpeg, when this is removed it seems to be sent correctly. The image signature seems to work for most people, it is only a few that have issues. The email client is Outlook 2007. I believe exchange is 2007.

I have attached the diagnostic information below, please can you offer any advice so that I can prevent this from happening in the future.

What does the 1.00 spam hits mean?

Many thanks,

Simon.

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Delivery has failed to these recipients or distribution lists:
RecipientEmailAddress

An error occurred while trying to deliver this message to the recipient's e-mail address. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message, or provide the following diagnostic text to your system administrator.

The following organization rejected your message: xxx.amnet.net.au.
  _____  

Sent by Microsoft Exchange Server 2007


Diagnostic information for administrators:

Generating server: xxx.xxx.local

RecipientEmailAddress
xxx.amnet.net.au #554 Your email is considered spam (1.00 spam-hits) ##

Original message headers:

Received: from xxx.xxx.local ([exchange IP]) by
 xxx.xxx.local ([exchange IP]) with mapi; Thu, 24 Jan 2008
 02:25:15 +0000
From: GC
To: Recipient
Date: Thu, 24 Jan 2008 02:25:04 +0000
Subject: are you busy for lunch today?
Thread-Topic: are you busy for lunch today?
Thread-Index: AcheMFRVO0DC9W35Qgedu+8BTOi2Wg==
Message-ID: <9CF16C57A83CA04994BF7A850F3637F60AE17E4ADE@xxx.xxx.local>
Accept-Language: en-US, en-GB
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
acceptlanguage: en-US, en-GB
x-tm-as-product-ver: SMEX-8.0.0.1181-5.000.1023-15686.002
x-tm-as-result: No--36.704200-5.000000-31
x-tm-as-user-approved-sender: No
x-tm-as-user-blocked-sender: No
Content-Type: multipart/related;
      boundary="_004_9CF16C57A83CA04994BF7A850F3637F60AE17E4ADE.xxx.xxx.hug_";
      type="multipart/alternative"
MIME-Version: 1.0
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