sendmail/mail command drop_privileges error on HP-UX

problem with HPUX sendmail, conversation and solution follows:

$ echo hi | mailx -s "test" myemail@mydomain.com
$ drop_privileges: setuid(0) succeeded (when it should not)

$ ll /usr/sbin/sendmail
-r-sr-sr-t   1 nonroot    mail       1339392 Aug 26  2004
/usr/sbin/sendmail

should be owned by root:mail

$ /sbin/init.d/sendmail stop
No sendmail server running
$ /sbin/init.d/sendmail start
drop_privileges: setuid(0) succeeded (when it should not)
451 4.0.0 can not chdir(/var/spool/mqueue): Permission denied


$ chown root /usr/sbin/sendmail
$ ll /usr/sbin/sendmail
-r-sr-sr-t   1 root       mail       1339392 Aug 26  2004
/usr/sbin/sendmail
$ /sbin/init.d/sendmail start
/etc/mail/aliases: 7 aliases, longest 9 bytes, 88 bytes total
sendmail