% uname -srm
NetBSD 1.2B i386
% mail
No mail for hiroy
% echo xxx | mail hiroy
% mail
Mail version 8.1 6/6/93.  Type ? for help.
"/var/mail/hiroy": 1 message 1 new
>N  1 hiroy                 Mon Nov 18 22:26   9/304  
& q
Unable to lock mailbox: Permission denied
% ls -ld /var/mail
drwxr-xr-x  2 root  wheel  512 Nov 18 22:26 /var/mail
% ls -l `which mail`
-r-xr-xr-x  3 bin  bin  69632 Nov 15 17:42 /usr/bin/mail
% 

Hiroyuki Ito