Re: [exim] ot: rDNS + spam assassin

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Author: Dave Lugo
Date:  
To: exim-users
Subject: Re: [exim] ot: rDNS + spam assassin
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.

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