On Mon, 19 Sep 2016, Mike Tubby wrote:

There is no 'law' that says your reverse DNS must work and its simply dangerous to use the heuristic no rDNS => High probability of SPAM.

I respectfully disagree.  It's as dangerous as any other very effective
spam filtering method - high accuracy, low FPs.

Yes, you should have some way to override the missing rDNS check.  But
rejecting on missing rDNS is mostly safe, in my opinion and experience.

Dave Lugo   dl...@etherboy.com    LC Unit #260   TINLC
Have you hugged your firewall today?   No spam, thanks.
Are you the police?  . . . .  No ma'am, we're sysadmins.

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