The RDNS test is run against the IP address of the original sending mail server, not the IP of the client machine that drafted the message. I don't believe that intermediate hops are considered in this test, just the RDNS of the originating mail server. Scott, can confirm this.
Declude JunkMail uses the same IP that it uses for getting the reverse DNS entry, and that is used for IP-based spam tests. By default, this is the IP address that connected to IMail. However, depending on the IPBYPASS and HOP settings, it may be different (for example, the IP address that connected to a backup or gateway mailserver).
-Scott
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