Email Template - Custom HTML import is replacing the fonts url leading to CORS error

Email Template - Custom HTML import is replacing the fonts url leading to CORS error

Hi,
    I am trying to create an email campaign with html import option. The html has reference to a font file in S3 (For example: https://campaign.s3.eu-west-2.amazonaws.com/Cabin-Medium.eot). In preview, I see that the font url is replaced with another static server URL (i.e. https://stratus.campaign-image.com/images/686634994951_7_zc_v1). 

The problem is that we receive CORS error 'No 'Access-Control-Allow-Origin' header is present on the requested resource.' when trying to access the fort url from https://stratus.campaign-image.com/images/686634994951_7_zc_v1 

Is there a way to import the html code without manipulating the original URLs in the html file? 

Thanks in advance,