If you check your Stat email at www-auth.cs.wisc.edu and have been using the "Squirrel Mail" interface, please note that it will be turned off on October 1st.
Please move to the Round Cube interface (should be the default interface when logging in to webmail). It has much more functionality. If you keep address books in the old Squirrel Mail interface, please contact me and we can see about exporting. Check your Round Cube interface to be sure they're not already there.
In general, I would not recommend relying on the online version of Stat mail to manage contacts.
Email the lab with questions.