HP-UX

I running sendmail as user smmsp I have create user,group with same name Sendmail start ok,but when i try to send email outside of localhost give me this error

Code:

Jan  3 20:46:59 hpux2 sm-mta[20893]: t03JkwJb020892:  t03JkxJb020893: DSN: Insufficient permission

I give those permissions

Code:

chmod 2755  /usr/sbin/sendmail 
chmod 700   /var/spool/mail 
chown smmsp:smmsp /var/spool/mail /var/spool/clientmqueue/ 
chmod 700 /var/spool/mail 
chmod 770 /var/spool/clientmqueue/ 
chmod 755 /etc/mail

What i miss?
Thanks

---------- Post updated at 03:35 PM ---------- Previous update was at 02:56 PM ----------

Solution found: was not a problem of permission,but a problem of mailx. On hpux is totally different mailx,and not allow "starttls" wich is required by my mail server. I have to use an external mailx or try to put starttls on sendmail if possible anyway thanks to all for help

I found this thread hoping you could help me. Here are instructions to add starttls to sendmail
Configuring Sendmail for STARTTLS

Is all this necessary to connect to an smart host that requires starttls authentication?