yahoo.com would require that all possible REVDNS entries contain "yahoo.com" so a message would pass the test if the REVDNS of its originating IP was abc.yahoo.com, abcyahoo.com or abc.yahoo.com.hk, but not yahoo.ca
Correct, but this has the drawback of blocking "[EMAIL PROTECTED]" if they do not have "yahoo.com" in the return address. In this case, it probably would not be an issue (few legitimate non-Yahoo domains would end in yahoo.com, and fewer would come from IPs with a reverse DNS entry that did not contain yahoo.com).
@yahoo.com yahoo.com would require that all possible REVDNS entries end in "yahoo.com" so a message would pass the test if the REVDNS of its originating IP was abc.yahoo.com or abcyahoo.com, but not abc.yahoo.com.hk, or yahoo.ca
Correct.
.yahoo.com yahoo.com would require that all possible REVDNS entries end in ".yahoo.com" so a message would pass the test if the REVDNS of its originating IP was abc.yahoo.com but not abc.yahoo.com.hk or yahoo.ca
Yes, but it would only apply to E-mails from [EMAIL PROTECTED] (specifically, any E-mail address with ".yahoo.com" in it).
-Scott
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