Use HREF command to apend logo to outgoing email messages

I am looking to create a hub transport rule that appends a company logo to all outgoing email messages. I have heard that you can use an href command in the "disclaimer text" to point to a file, but i cannot get it to work. The command that i am using is

<A HREF="http://internal_servername/ImageLibrary/Images/Logos/Logo.tif">

When I use this it simply shows the text above. I am no HTML expert to say the least so any help someone might be able to give would be appreciated or if you have another suggestion to get this done I'm all ears. Thank you.
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Outlook 2007 doesn't support html in signatures anymore.  I'm not sure about the server specific side of things, but i'm guessing they nixxed html there too. I think there's a wizard in exchange to do these rules, so try linking just the straight file, and letting outlook do the rest.

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