cd /etc/mail/cf/cf
vi sendmail.mc (add SMARTHOST)
define(‘SMART_HOST’.’the smart host fqdn’)
/usr/ccs/bin/m4 ../m4/cf.m4 sendmail.mc > sendmail.cf
mv /etc/mail/sendmail.cf /etc/mail/sendmail.cf_ORIG
cp /etc/mail/cf/cf/sendmail.cf /etc/mail/sendmail.cf
svcadm restart smtp:sendmail