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Exhange 2007 isn't sending emails to my Exchange 2003 or outside domains

I installed my first Exchange 2007 server into my Exchange 2003 organization. i moved over a test mailbox and am able to send emails to the users in the 2003 server and to my gmail account but when replying to the email it bounces back to me

here is the message:
Your message did not reach some or all of the intended recipients.

Subject: testing from 2003 to 2007
Sent: 10/23/2008 10:55 AM

The following recipient(s) cannot be reached:

test on 10/23/2008 10:55 AM
You do not have permission to send to this recipient. For assistance, contact your system administrator.
<MAIL.domain.com #5.7.1 smtp;550 5.7.1 Unable to relay for test@domain.com>

note: MAIL is my exchange 2003 server

thanks for your help Experts

futurefiles

you need to add your accepted domains to the hub transport section
ope the exchange system manager
goto Organisation Configuration
Hub Transport
Accepted Domains

bangtnguyen

ASKER

my internal domain is in the accepted domain list and still nothing.

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futurefiles

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bangtnguyen

ASKER

what i did is delete the routing connectors in my 2003 server. removed the hub transport service from my 2007 and re-installed it. this recreated the routing connectors and then i set up my send connector once more. this seemed to do the trick.