out of office reply comes from external Sender as Internal sender in exchange 2010

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Exchange-Server

I have Created two Organization(1. org01.local and 2. org02.local ) and also created one user in each Organization i.e user1@org01.local and user2@org02.local.

When i login to Owa from user1@org01.local and set Auto Relpy Out Of Office Setting applied for both users i.e for internal as well as external as "internal out of Office "and "external out of Office" resp. and sent email from user1@org01.local to user2@org02.local

but, i got reply as "internal out of Office" even if user2 is from external organization.

Please give me a solution.

thanks in advance