It sounds like a forum for whistleblowers so nobody within the “work” organization can be traced as an identifiable email user.
If that is the purpose, or something like it, then you would also have to ensure that the “work” users do not and more importantly cannot use “work” resources to access the website.
If you don’t then “work” can find out by monitoring IP addresses, process usage, browser history, post times, etc. With enough vectors they can more easily triangulate any individual even if no single vector points directly to one individual.