Only Nagios doesn't works with sendmail?

[quanta]

Hi,

I am using sendmail 8.13.8-8 with Gmail SMTP.
sendmail works fine with OSSEC or test from command line, but it has
problem with Nagios:

sendmail[9026]: NOQUEUE: SYSERR(nagios): can not
chdir(/var/spool/clientmqueue/): Permission denied

Add the *smmsp* user to *nagios* group, I get the another error:

sendmail[26435]: NOQUEUE: SYSERR(nagios): can not write to queue
directory /var/spool/clientmqueue/ (RunAsGid=0, required=51): Permission
denied
 
The permissions of related files:

-rwxr-sr-x 1 root root 775064 Jun 29 23:46 /usr/sbin/sendmail
 -rw-r--r-- 1 root root 59061 Jun 30 11:23 sendmail.cf
 -rw-r--r-- 1 root root 40336 Jun 30 12:18 submit.cf
 drwxrwx--- 2 smmsp smmsp 114688 Jul 22 22:00 /var/spool/clientmqueue/
 drwx------ 2 root mail 4096 Jul 22 22:24 /var/spool/mqueue/

Nagios only send mail if I changed the permission of
*/var/spool/clientmqueue* to 777, but it is a dirty solution and I got
the warning:

sendmail[30462]: dangerous permissions=40777 on queue directory
/var/spool/clientmqueue/

PS: Nagios on the another server works fine with 770 permission of
/var/spool/clientmqueue.

Can anyone help me?
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