Sam Hayes Merritt, III wrote: > > I've searched and cannot find so I'm hoping someone can help. > > We have a RBL we host that contains the domain names of dynamic hosts, > spammers and other we do not want to receive email from. > > Currently in sendmail we use the revised dnsbl.m4 from Derek Balling > (http://www.megacity.org/software_downloads/dnsbl.m4) which looks up the > hostname of the connecting machine against a RBL. I'm trying to > duplicate that in Sendmail as it provides us a lot of usefulness and > would get us away from the blanket rejects. > > Are there any rules written to do this in Spamassassin? I see IP RBLs > and I see RHSRBL, but I don't see domain-based RBLs that check the > connecting machine. >
The closest is RHSBL, as these are hostname based, not IP based. But these look up the full hostname, not just the domain name. You could handle this on your back-end with wildcards... However, on the "connecting machine" part, SA does not have any concept of what the "connecting machine" is. SA doesn't even know there's such a thing as a connection. SA can only perform RBL checks against what it finds in the Received headers. In general, with a few exceptions, SA checks theevery host in the Received: headers that isn't a part of internal_networks. It checks the IP of each against all the RBLs and the host name of each against all the RHSBLs.
