When I try to send mail from the 'root' user to same user I receive the following error: "# /etc/mail/submit.cf: line 527: fileclass: cannot open '/etc/mail/trusted-users': World writable directory" How do I fix this?

For security reasons the permissions for the trusted-users file should be set to 644 and the permissions for the mail directory that contains this file should be set to 755. If they are set to anything else then an error will be generated.

To set the permissions for this file use the following command (executed as root):

#chmod 644 /...