Outlook 2010 Automatic Replies - how can I disable the internal reply

I'm running an Exchange 2010 SP2 RU8 mailbox server with Outlook 2010 clients in offline synch mode.

We've got the Out of Office set up on a shared mailbox to use as an autoreply for external customers only.

We don't want internal senders to receive a blank response but I cannot find a way to stop it.

I tried setting up an Out of Office rule so that for internal senders it would trigger the rule to perform an action. It does this but still sends the blank internal reply as well.

Has anyone managed to do this themselves and would be willing to share how ?

Many thanks.
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Murali ReddyExchange ExpertCommented:
At this moment I do not see any option.
yitopmAuthor Commented:
By chance I found that the reason it was posting an internal out of office reply was that somebody had entered a space character in the response field. Obviously it looked like a blank entry but as soon as I removed the space character, the code logic must now be determining that an internal reply is not needed and not generating one. Seems like poor design to me.

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