This all assumes you havn't manually hacked your sendmail.cf, if you have, the following steps will eat any changes youve made (but then, it looks like your patch did that too, so...)
- cd /etc/mail
- cp -p sendmail.cf sendmail.cf.borked
- cd /usr/lib/mail/cf
- make
- cp subsidiary.cf /etc/mail/sendmail.cf
- /etc/init.d/sendmail stop
- /etc/init.d/sendmail start
- tail /var/adm/messages
*I haven't worked with sol7 for a while, it could be /etc/sendmail.cf instead of /etc/mail/sendmail.cf