Newsletters should always use absolute references to all links and images within the HTML. Relative paths don't contain the server information so external users see a broken link/image - the outside email application won't find the where the file is.
<a href="/ssw/Company/ContactUs.aspx "><img src="/SSW/images/SSWLogo.png" /></a>
❌ Figure: Bad example - Using relative paths for both link and image on a newsletter
<a href="https://ssw.com.au/ssw/Company/ContactUs.aspx "><img src="https://ssw.com.au/SSW/images/SSWLogo.png"/></a>
✅ Figure: Good example - Using absolute paths for both link and image on a newsletter