I try to chown the owner of a file to root, but I can't. I'm doing this as root. I get the following message:
chown: changing ownership of `ps': Operation not permitted
I have a lot of emails in /var/spool/sa-exim/SApermreject. Can I remove these emails or will this lead to some kind of nasty spam problem? Or is this just a history of all the emails that were never received by anyone?