Thank you kindly, Fly-Man, for a patch that:

* Added the hostname so the email gets the 
right hostname when going outbound

OpenSim/Region/CoreModules/Scripting/EMailModules/EmailModule.cs

@@ -302,7 +302,7 @@ namespace OpenSim.Region.CoreModules.Scripting.EmailModules
                     emailMessage.Send(smtpServer);
 
                     //Log
-                    m_log.Info("[EMAIL] EMail sent to: " + address + " from object: " + objectID.ToString());
+                    m_log.Info("[EMAIL] EMail sent to: " + address + " from object: " + objectID.ToString() + "@" + m_HostName);
                 }
                 catch (Exception e)
                 {