open mail relay in Sendmail 8.10.2.

We are using sendmail 8.10.2 on our mail servers running on Solaris 2.6 and 2.7. Due to some configuration loophole, our mail servers have been included in ORBS database due to open mail relay. Can someone guide me in detail how to close this open mail relay
and to get our servers out of ORBS databse.