Congratulations on the interview!
That e-mail means that you have been ranked. They add people on the rank-list each Thursday (although they usually don't get to every interviewee that week so they tend to be behind...looks like about 3 weeks behind right now). They admit people from the rank-list once each month.
I was interviewed on January 26, ranked on February 1st and accepted on February 14 (the best valentines gift I've ever received). I assume the last acceptances were from March 14 and the next will be April 14. They send the appointment letter by regular mail so even though I was officially appointed on February 14 I didn't get my letter until February 25 (mail to Fairbanks, Alaska is always very slow). There is no e-mail or phone call. I am sure you can call Jane and ask your status. She seems always happy to hear from the applicants. Good luck!
With whom did you interview? How did it go? How did you like Mayo?