If your server is blocking CSS and images from loading, you will need to modify your web server configuration according to the Content Security Policy (CSP). CSP is a security feature that helps prevent a number of attacks such as Cross-Site Scripting (XSS) and data embedding attacks.
We list the CSP directives that you can use to enable CSS and image loading from servers (CDNs) used by Mailocator.
style-src: This directive controls where style templates can be loaded from.
img-src: This directive controls where images can be loaded from.
The HTTP header should contain:
Content-Security-Policy: style-src 'self' ml-cdn.net mlcdn.eu; img-src 'self' ml-cdn.net mlcdn.eu; For example, if you are using an Apache server, you can add the following lines to the .htaccess file or the server configuration:
Settings for Apache
Header set Content-Security-Policy "style-src 'self' ml-cdn.net mlcdn.eu img-src 'self' ml-cdn.net mlcdn.eu;"Settings for nginx
add_header Content-Security-Policy "style-src 'self' ml-cdn.net mlcdn.eu; img-src 'self' ml-cdn.net mlcdn.eu;";