Erreur /var/log/syslog

.... sendmail[15472]: NOQUEUE: SYSERR(root): can not chdir(/var/spool/clientmqueue/): Permission denied

drwxr-xr-x 19 root  root  4096 Apr 28 16:09 var
drwx--x---  5 root  root  4096 May  2 18:34 var/spool/
drwxrwx---  2 smmsp smmsp 4096 Feb 17  2011 var/spool/clientmqueue/

Solution, chmod o+rx /var/spool

/var/spool/clientmqueue

List clientmqueue:
# sendmail -Ac -v

Run clientmqueue:
# sendmail -Ac -q -v-

Source: http://lists.freebsd.org/pipermail/freebsd-questions/2004-September/057172.html
Source: http://www.linuxweblog.com/sendmail-clientmqueue-mqueue