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Regardless of Open ACLOn Proxy Updates being set to 1 by default, it is recommended that it be set to 0.
In order to set Open ACLOn Proxy Updates to 0, take the following steps.
If you want more information you may find the following useful:
In order for the DNS Update Proxy Group to update the DNS resource records, a global parameter has been introduced.A reverse DNS program looks up the IP address of an incoming message and, if no valid domain name is found, the server blocks the message.Although reverse DNS is fairly effective for filtering spam, it also often blocks valid emails.This global parameter, Open ACLOn Proxy Updates, disables previously existing functionality where the DNS Update Proxy Group can be overridden by sources which are not part of the DNS Update Proxy Group.Additionally, when performing a secure dynamic update, Open ACLOn Proxy Updates is set to 0.