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Basically, you have to create a new receive connector, add the IP and modify the receive connector permission<br />
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<a href="http://exchangeserverpro.com/exchange-2013-configure-smtp-relay-connector/" rel="ugc">http://exchangeserverpro.com/exchange-2013-configure-smtp-relay-connector/</a><br />
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<a href="http://technet.microsoft.com/en-us/library/bb232021(v=exchg.141).aspx" rel="ugc">http://technet.microsoft.com/en-us/library/bb232021(v=exchg.141).aspx</a>
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Basically, you have to create a new receive connector, add the IP and modify the receive connector permission

http://exchangeserverpro.com/exchange-2013-configure-smtp-relay-connector/ [http://exchangeserverpro.com/exchange-2013-configure-smtp-relay-connector/]

http://technet.microsoft.com/en-us/library/bb232021(v=exchg.141).aspx [http://technet.microsoft.com/en-us/library/bb232021(v=exchg.141).aspx]

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Which Receive Connector in Exchange 2013 needs to be modified to add IP restrictions in order to have inbound coming from only one block of addressing? (3rd party filtering service)
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Which Receive Connector in Exchange 2013 needs to be modified to add IP restrictions in order to have inbound coming from only one block of addressing? (3rd party filtering service)

Receive Connectors on Exchange 2013

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