troubleshooting Question

Exchange 2010 not receiving from one domain and not sending to another

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jckingcpa asked on
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We have Exchange running on SBS 2011. One customer we cannot send to from Exchange but can send to via gmail. We can receive messages from them. Another we can't receive from but we can from gmail. We can however send to them. Both are completely different customers. How can i determine why we can not communicate with them? I checked MXTool box and they are not blacklisted.

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