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Reverse DNS configuration

Hello,

I'm trying to configure a reverse DNS for smtp email scoring

My instance :

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My DNS Settings  : according to the documentation the should be :

73-32.134.61.130.in-addr.arpa : reverse IP for 130.61.134.73/32

When I create the zone, I already have the message : "Authorization failed or requested resource already exists."

Any Idea ?

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