I've wondered that on other sites, where the e-mail I used on my account no longer exists, and I don't know how to change the user account and add a new e-mail. I had a g-mail email and a yahoo e-mail, and with both of those, if you don't use it for 30 days or so, they close it and allow someone else to claim it. So my user-name accounts for things like the Washington Post and Wall Street Journal have expired.
If you had the same e-mail, you could just ask the system (i.e., Rob) to mail a new temporary passwword to your existing e-mail and then change it.