Exchange 2000 Mail enabled public folder

I'm running Exchange 2000.  I've created a mail enabled public folder.  I can send mail to it just fine.  However most other users can not?  They get this message back from the exchange server:

The message reached the recipient's e-mail system, but delivery was refused.  Attempt to resend the message.  If it still fails, contact your system administrator.

Not sure how to fix this or why its happening.
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stamperbAuthor Commented:
OK so I gave another user owner permissions on this mailbox and he then could send mail to it.  Does anyone who wants to send email to a mail enabled public folder have to own it?   What about external people sending in to its smtp address?
set the anonymous account to "contributor"

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Chris DentPowerShell DeveloperCommented:

The Anonymous Permission grants anonymous users (external users) permission to send in. Generally you'd set that to Contributor.

The Default Permission grants your Authenticated Users (internal users) permission. Depending on your needs you can set th at to Contributor or Author.

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