How do I disable posting to a mail enabled public folder, but still allow regular emails?

We have an Exchange 2003 server with a (mail enabled) public folder for incoming orders. When anyone within our organization sends an email to the folder, it is fine. But when someone from outside our organization sends an email to it, it arrives like a posting. Instead of showing a little closed envelope icon, they have an icon of a small piece of paper with a thumb-tack stuck in it. I understand that this is probably by design, but my question is, how do I make it so ALL emails arrive as regular emails instead of "postings"? Thanks
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robw24Asked:
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LeeDerbyshireConnect With a Mentor Commented:
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robw24Author Commented:
Yes, that helped me fix it. Thanks
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