This mail is only relevant for you if you have activated Mathjax support in ILIAS to render LaTeX (for mathematical expressions).
The default Mathjax server mentioned in the Mathjax administration of ILIAS has been shut down recently. If you use this URL to render LaTeX in the browser, this won’t work any more. There is a new default Mathjax server available at
https://cdnjs.cloudflare.com. To use this server, please enter the following string to the input ‚URL to Mathjax‘ at Administration » Third-Party-Software » Settings » Mathjax :