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Exchange 2013 connection with outlook

Last Modified: 2015-03-04
Dear Experts,

 I have an exchange 2013 running with fortigate Dynamic DNS.
I have configured smart host relay to send on behalf. Also setup email gateway since our isp blocks port 25.

The problem is, i only want give exchange connection  from their devices if they are on the same internal  network.
But if they connect outside the network they cannot connect their outlook to my exchange server.
Only way they can connect to exchange 2013 outside is through VPN. only after vpn network is established.

But  the problem is when the users are connected to another network they still can access the exchange server and they can send and receive emails.

please help me in sorting out this issue as my management doesn't want  any external connection to exchange.

Thanks and Regards
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