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reject smtp connections if no valid reverse dns?

Hey folks,

In my attempts to deal with the massive increase in spam lately, I've 
noticed a number of messages arrive from mail servers that do not have 
correct reverse DNS mappings.  Any chance of getting a flag for this in 
smtpserver.conf, or am I just being blind and not finding it?

"You will be reincarnated as a toad; and you will be much happier."
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