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Iphone Can't get Exchange mail on LAN but ok on 3G.

Last Modified: 2012-06-27
We have a exchange 2003 sevrer and a OWA 2003 server as well.
When the domain was installed whoever installed it named it mycompany.com
Our exchange server is owa.mycompany.com.
This is the setting people put in their iphone to get exhcnage mail when they are on 3g. When they come to work and connect to our internal wifi, the mail server does not connect. So i tried adding a different dns record called owa1.mycompany.com and pointed it to the outside public address. The phones still do not like this and will not connect when they are in our wifi zone.
I know calling the domain the same thing as our websites, email servers etcc is wrong but i did not set it and changing it is not a option.
Thanks in advance.
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