We have Sendmail 8.8.8 and we handle mail for a couple of different domains. But unfortunately some spammers misuse this and use us as a relay host. I used to bolck them off using the Ip address or the domain name via the firewall but unfortunately they get thro to some other ISP and still use us as a relay host ....I need to stop Relaying based on the To addr if it doesnot concern my domains which I handle I should not allow them to do so ...
Is there some way where in I can protect or accept mail to my domains for which I have a Cw entry and disallow mail to any other domains ..
By the way I have Solaris 2.5.1 Running ..
Please Help !!
Thanks in advance