>In the Word Filter we can use a line as such:
>
>REVDNS   -5   CONTAINS   yahoo.com
>
>The domain name listed here refers to Yahoo.com specifically or like the 
>BlackList or WhiteList refers to anything that ends with Yahoo.com?

The CONTAINS in this case will match any reverse DNS entry that contains 
"yahoo.com" in it ("mail.yahoo.com", "notyahoo.com", 
"yahoo.com.spammer.com", etc.).

>For example does the above also assigns a -5 to SpamYahoo.com?

Yes, it does.  You could instead use:

         REVDNS  -5      CONTAINS        .yahoo.com

since no Yahoo.com mailserver reverse DNS entry should be just "yahoo.com".

We may later add an ENDSWITH that could be used here, to prevent 
"yahoo.com.spammer.com" from matching (but on the other hand, if they did 
that, they could just as easily use "mail.yahoo.com" as the reverse DNS entry).
                         -Scott

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