If you find that none of the email links on ArtStation or on your ArtStation powered website are working, it means you have not set up a default email client with your browser. If you don't set up a default email client, no email links will work on ArtStation or anywhere else.
ArtStation uses the universal HTML mailto tag that has existed practically since the internet began.
The tag looks like this:
With webmail becoming more popular, browsers sometimes don't get set up with a default email application.
The solution for this is to set up an email client with your browser. Google "how to set up mailto links on my browser" to find solutions for your specific browser.