As stated above in my previous posts, I have already defined these 2 properties in the control:
<FTB:EDITOR id="txtMessage" UseRelativeLinks=false RemoveServerNamesFromUrl="False" runat="server" Width="720px" Height="500px" EnableStripScriptTags="False">
This doesn't work; as many users have stated: the newsletter has to be saved or viewed in html mode first before the absolute path gets correctly set.