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Block ActiveSync Externally, allow internally - Exchange 2016.


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You could have a responder policy that evaluates the client IP address. If it is an external (public) address, you could drop the request or return other content.

 

Internal IP addresses are defined by RFC 1918 (see wiki page), so your policy could look like this:

add responder policy DropExternalRequest "CLIENT.IP.SRC.IN_SUBNET(10.0.0.0/8).NOT && CLIENT.IP.SRC.IN_SUBNET(172.16.0.0/12).NOT && CLIENT.IP.SRC.IN_SUBNET(192.168.0.0/16).NOT" DROP

Bind that policy to your server and you should be good. It will only be matched/evaluated for external IP addresses.

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