I've added the images I want to use according to KB 000030266, and when I when I 'view' the email the images show up fine. However when they are actually received as emails in my inbox, the image just shows as a red X.
I also can only get results if I use the shortened url (as according to the document) like such
<img src="/aveksa/custom/images/"Image_Name" />
There is another discussion that suggests using the full pathname. This doesn't either.
(<img src="https://yourhost/aveksa/custom/images/headerTest.png"> )