Can you post the source code of the template you are using?

<span style="font-size: 9px;"><img alt="" src="https://system.na1.netsuite.com/core/media/media.nl?id=11&amp;amp;&amp;c=4769362_SB1&amp;amp;h=42939ce878319423fa41" style="width: 186px; height: 60px;" /></span><br /> This is the only part with a netsuite URL and its for the image

With the account specific domain changes, now need to use https://4769362_SB1.app.netsuite.com And note, this template will only be good to use in your sandbox (SB1) account. You will need to modify the templates in production to reflect your production account number URL. We just had to do this for dozens of templates.