Hi,
we are running on Solaris 10 and I see that under
/usr/mail
-rw-rw---- 1 root mail 0 Nov 26 11:19 root
-rw------- 1 root mail 2 Nov 24 17:14 root.lock
-rw------- 1 root mail 2 Nov 27 09:26 root4_aGD6
-rw------- 1 root mail 2 Nov 27 09:26 rootHAaqyo
-rw------- 1 root mail 2 Nov 27 09:26 rootS9ayi5
looks like to root is locked , I would like to now
why and hwo can I unlock it ??
any Help is appreciated , Thanks
remove/rename the file. How did you know that sendmail is locking root?? 
ok,
I can remove those files:
-rw------- 1 root mail 2 Nov 27 09:26 root4_aGD6
-rw------- 1 root mail 2 Nov 27 09:26 rootHAaqyo
-rw------- 1 root mail 2 Nov 27 09:26 rootS9ayi5
but I cannot remove even from the console
-rw------- 1 root mail 2 Nov 24 17:14 root.lock
in any case it told me " permission denied"
it is not that the root account is locked but no mail coming from root
and the sendmail is using more and more cpu power
I now stopped the service and restarted it, looks better but still I do not understand why root.lock was created and I cannot delete it, maybe a reboot would clean this but I am more interested why....
As root, chmod 700 <filename>
rm <filename>
even if I do it via the console I cannot chmod 700 nor rm root.lock...
it just says "permission denied"
Are you using root a/c? 
what you mena with "root a/c" ?
After i tried it on a normal shell after becoming root I tried it via the system console as real root but still get the "permission denied" so I cannot chmod 700 .
I stopped sendmail service on Solaris 10 and tried again no result.
I be able to reboot it this Friday night but sofar I unable to fix it.