Whitelist_from_rcvd and multiple DNS resolvers causing problems?

[Joe Smith]

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I'm using SpamAssassin 3.0 when I use whitelist_from_rcvd with domain 
names that reverse to only one possible domain it works just as it 
should. When the domain name is one that has multiple possibilities 
that it can reverse dns to then it doesn't work unless it happens to 
pick the domain name listed in my whitelist_rcvd_to entry. For example, 
if I create an entry for whitelist_from_rcvd [EMAIL PROTECTED] domain1.com 
but the server hosting domain1.com also hosts domain2.com, 
anotherdomain.com and anotherdomain.net, I have problems. Say the 
server that hosted email for the domain I wanted to whitelist had an ip 
of 123.123.123.1 and I did dig -x 123.123.123.1, it would give me all 
the various domains that that address is configured for.

I think this is what's going on anyway. I looked at the output from 
spamassassin -D -t < problem then I notice that the rdns= is for one of 
the other domains hosted on the server and not the domain I would like 
to whitelist. When I examine the same output from a message that is 
working, the rdns= is the domain name that I specified in the 
whitelist_from_rcvd entry. Do I need to specify the IP address of the 
server using multiple dns entries to get whitelist_from_rcvd to work or 
should this not be an issue and I need to look at other reasons why 
this particular domain is causing problems.