Entropy gathering module - permissions problem

I have a server running Lenny and have a problem in that users are unable to send mail from scripts or the cl [EMAIL PROTECTED]:~$ mail -s "test" [EMAIL PROTECTED] Fatal: no entropy gathering module detected Aborted Adding a user to the sudoers with permission to x /usr/bin/mai

entropy gathering module

Just configured a new VPS and when I try to get mail for the user (as opposed to root) I get 'no entropy gathering module detected' as a fatal error. If I run 'mail' as root there are no errors (and no mail) I've googled for this but the few results yeild no solut