Sendmail: dangerous permissions
If you ever get the following errors
Feb 6 14:31:22 server sendmail[10862]: dangerous permissions=40777 on queue directory /var/spool/clientmqueue/
Feb 6 14:31:41 server sendmail[10875]: NOQUEUE: SYSERR(root): can not chdir(/var/spool/clientmqueue/): Permission denied
This means that the permissions for the folder /var/spool/clientmqueue/ are incorrect
simply correct the error by running the following commands
chown -R root:smmsp /var/spool/clientmqueue
chmod 770 /var/spool/clientmqueue