Usually such mails contain very precise questions, ie where can i found info on xx ethnic group?.
Either an answer is sent straight away (like one on the Eshira of Gabon), or one is directed to a discussion list or an anthropology department. Sometimes, true, due to the work load, an answer will wait in the computer for a couple of weeks… If you need a fast answer, ie ‘…help, i am doing a presentation tomorrow afternoon…’, sorry but try another address ! Also, students should be encouraged to do their own research rather than hoping for someone else to do it for them…