exchange 2007 - Why can I send an email to an external email address from outside of the server but not inside?

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I have an email address that is a
forwarded address hosted on GoDaddy. It forwards to an email address on my Exchange 2007
Server. My clients have no problem sending to it and if I use my own G-Mail account I
have no problems. The strange thing is that anyone on our domain cannot send an email to
that address without receiving this
message:

Delivery has failed to these recipients or distribution
lists:

info@l****e.com

The recipient's e-mail address was not found in the recipient's
e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please
check the e-mail address and try resending this message, or provide the following
diagnostic text to your system administrator.

/>

Sent by Microsoft Exchange Server 2007

There
was more to the error message but it's pretty long so I didn't post it. I can if you
need me to.

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class="normal">Answer

Use the
message tracking center to follow the message. I'm guessing that your Exchange server is
trying to answer the message directly, instead of sending it out to GoDaddy, and that
something in the way your forwarding or Exchange is setup means it doesn't work. Does
the server try to send it out to GoDaddy?

If you
can post the long bounce that would be helpful as it would say which server is
generating the error - is it yours, or GoDaddy's?