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My Auto reply public folder only replies to internal mail. External mail makes it to the folder, but from an external test account, we do not get a reply. Where can I begin to look to find where this problem is. I wish this public folder to reply to everyone who sends a message to it.

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Do you get external out of office messages to regular mailboxes? – Ben Pilbrow Feb 18 '11 at 17:49
I'm not sure what you mean by this, we do not have any issues with out of office messages. – Mister IT Guru Feb 21 '11 at 11:37
It seems that no!! OOR do not seem to be working?! * completely shocked* Where can I go from here? – Mister IT Guru Feb 23 '11 at 11:36

Require sender authentication is ON?

Check setup here:

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Welcome to Server Fault! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – slm Sep 25 '13 at 23:27
up vote -1 down vote accepted

I nuked the exchange box, and rebuilt if from scratch - worked so much faster and better.

Lesson learned: If you know you can build it better, do so!

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