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5.1.0 - Unknown address error 550-'Unrouteable address' even though recipient policies setup

Hi I wonder if any of you can help.
My customer has 3 differents domains and thus emails which he wants to recieve on the new SBS 2003 server.
SBS is setup correctly and recieving ok email addresses to john.com
I have setup via the hosting company for the MX records for domains peter.com and paul.com to point to the servers ip and opened the ports in the Routers firewall.
Recipient policies in Exchange are set to a primary smtp entry for john.com
added additional smtp records to peter.com and paul.com

But still no emails and I get the following email bounced back

The following message to <richard@peter.com> was undeliverable.
The reason for the problem:
5.1.0 - Unknown address error 550-'Unrouteable address'

All help gratefully recieved and thanks in advance.
PS New to exchange so probably something easy.

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bkrings

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rjandrews2008

ASKER

Thanks, can you advise how I go about doing this?? Have checked the properties of the default policy (its this one I added the additional domains too) but can't see anything.

rjandrews2008

ASKER

Hi, found it. Deleted and re-added the domain names and made sure the "This Exchange Organisation is reponsible for all mail delivery to this address" was ticked for each. (it appears when you add the smtp address in for people who don't know)

Will do some tests and get back.

rjandrews2008

ASKER

Looks like that works, wierd almost like something didn't stick. Re did the policy and seems ok now.
Thanks very much for all your help.