[CentOS] No "you have new mail" message on login

Tue Mar 30 01:33:56 UTC 2010
Ian Masters <ian at acces.co.jp>

Hello

I have a few servers running CentOS release 5.4 (Final) and none of them are
displaying a "you have new mail" message on login.

I've asked Professor Google but he is strangely silent. Have I neglected an
important setting? I thought this was a default on most linux ditributions.

Any help much appreciated.

Ian