Username {redacted} might have been mine, a very long time ago. But it doesn't respond to a password reset request at any email I currently own. It's possible I never registered an email address, or it's an email that I no longer control (I've sold a few domains). Is there any way to find out? I can communicate the username and all possible domain names privately and am fine with a simple "yes/no" - I don't want to get any private information, just know whether I should create a brand-new user account or not. Thanks!
Topic on Project:Support desk
...and if this isn't the correct help forum for that kind of question, I'm happy to be directed to a more appropriate one?
I dont think so.
You can find out if an email was set at all and validated by if special:emailuser works. No way to find the domain.