Shell Programming and Scripting

My department uses an outlook mail merge to send login information to multiple users who request access. I would like to use sendmail for obvious reasons. I copied a sample email source, with all the disgusting html formatting from outlook, and can successfully send emails almost exactly as I did in outlook. In order for the html to work I include the following (per previous help on the forum):

Code:

echo "MIME-Version: 1.0"
echo "Content-Type: text/html"
echo "Content-Disposition: inline"

The only thing left is I need to include a logo in the body of the email at the top. I have put the gif into the directory where the email script is, and the logo name is included in the html formatting. I have not changed the name of the gif. The gif as full permissions. I have tried specifying the absolute path of the gif but it still shows as a box containing the name of the file and another smaller box that contains a red X. I'm viewing the email in Outlook (as the user would do) so I'm wondering if Outlook is unable to reference the logo? Perhaps there's another thing I have to echo in in order to show logos? Thanks.