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Why can't external people email a distribution group email address on Windows SBS 2008 server

I have a windows 2008 SBS server and I can email various email addresses/mailboxes within the exchange server. I setup a distribution group info@mydomain.com using the wizard withing the Exchange Managment Console. I can email info@mydomain.com from within the organisation (i.e. mailboxes on the exchange server) however I cannot email from outside the exchange server. I get a returned message as follows ...

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

      Subject:      Test 03
      Sent:      08/09/2010 15:06

The following recipient(s) cannot be reached:

      info@yourdomain.com on 08/09/2010 15:06
            The e-mail system was unable to deliver the message, but did not report a specific reason.  Check the address and try again.  If it still fails, contact your system administrator.
            < smtp.server.com #5.0.0 X-Postfix; host x.x.x.x[x.x.x.x] said: 550 5.1.1    User unknown (in reply to RCPT TO command)>

x.x.x.x is the IP address of my firewall who has a NAT and firewall rule to allow mail through to the exchange server. This is working as I do recieve emails for the other mailboxes.

Any ideas on where the restriction is? I thought it might be that the distribution group is set to only work internally but I cannot find the setting to change it.
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btec_bob
Asked:
btec_bob
1 Solution
 
Dave StringfellowIT managerCommented:
On the distribution group, you will need to enable the people to email to it from the outside world.

Open the Group in question, mail flow settings, message delivery restriction, and untick the "requires that all senders are authenticated"
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btec_bobIT Services DirectorAuthor Commented:
Perfect
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