RDNS_NONE

[Jimmy Stewpot]

Hi There,

I have recently been getting a huge increase in the number of emails 
which are being marked as spam. In those emails I see that the headers 
say RDNS_NONE. It seems that in most cases the remote servers in the 
header do in fact reverse resolve. I have checked randomly in about 30 
messages that have been marked in this way. Am I missing the point of 
RDNS_NONE as a rule? What is it meant to actually be doing?

Regards,

Jimmy