Need help setting up email forwarding from spam host to Exchange behind a Sonicwall

I have an offsite spam filtering solution that all of our mail is routed to first and then forwards mail to our Exchange Server that sites behind a Sonicwall. Incoming mail is rejected with a "recv: 550 5.7.1 Unable to relay for . . ." error.
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timdollAsked:
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rizwanidreesCommented:
all IP if your spam server to relay in send connector (Exchange 2007), smtp settings in exhcnage 2003
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Alan HardistyCo-OwnerCommented:
Is your Exchange server set to be authoratitive for your domain?
http://support.microsoft.com/kb/823158
If it is not authorative, then you will get bouncing messages.
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timdollAuthor Commented:
Thanks alanhardisty - that was it.
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