jbrob

To do it manually, have a look at e.g. https://toolbox.googleapps.com/apps/dig/#MX/ and enter a domain name (say total.com). Here you'll see that total.com uses outlook.com as their e-mail service. Given a list of domains, something like this can be automated easily enough.

I had the same thing. Resetting my password on Jetbrain's website and the IDE sorted me out.