If the client mailkey is showing as your external IP address, it suggests that your local clients are going through your router to get to your local server.
Assuming 192.168.1.101 is the internal address of your server, on your local clients, add an entry to c:\windows\system32\drivers\etc\hosts to map your server dns name to the internal server address, i.e. add the line
192.168.1.101 eplay.dyndns.org
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