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I have a number of clients who have government and Ministry of defense clients who keep getting email bounce by our servers for spam filtering with the error:
Mail rejected due to SMTP Spam Blocking: _REVERSEDNSLOOKUP, * HostKarma - Whitelist
I am sure the MOD and governments have their servers set correctly so does that men I have might setup wrong?
Based on various recommendations by SM and other people I have my reverse DNS weight score set to 35 and my SMTP Blocking weight threshold set to 25, so I can see why the above rule is firing.
HostKarma - Whitelist is set to score 0
Are these scores TO STRICT or should I up them?