>When trying to email the UT sysops, I get an error to the effect that I have not entered an email address in "mail and news preferences". Looking through Account Configuration, I do not see a "mail and news preferences". So where is this entered?

Sounds like you mail client is not set up properly. Does it work with other email links on other webpages?

A workaround is to send a private message to the sysop. Click on their name and you will see the link.