Exchange 2003 and MailMarshal SMTP issues

I'm trying to configure a third email domain in Exchange. After configuring the second one I assumed that to get t third one working I would just have to repeat the steps I took but the third domain is not working.
I checked all the settings in Exchange and MailMarshal and both were the same but no email.
I added the third email domain to the second domain's recipient policy and updated the RUS again; still no email.
I'm rapidly running out of ideas!

Any help would be greatly appreciated.
AndyDotNetAsked:
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AndyDotNetConnect With a Mentor Author Commented:
Okay, so we've solved the issue with the 3rd domain address not working. It was simply the order of the addresses in the MailMarshal routing table. Putting the .co.uk address ABOVE the .co address has solved the problem and now both addresses work.

However...the .co.uk address is still not filtering through to Active Directory so I've added them manually...luckily there aren't that many users!
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Glen KnightCommented:
What happens when you try to send mail to the new domain?

Have you configured the MX record for the domain?
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AndyDotNetAuthor Commented:
Yes I have configured MX records in the same way for both domains.
I have added the domains to the Exchange Recipient Policies.
I have re-built and updated the RUS.
I have restarted the SMTP and Exchange Routing Engine services.
I have added both domains to the MailMarshal domains table.
I have added both domains to the MailMarshal routiing table.

When I send mail to the 3rd domain I get a reply from the postmaster at the 2nd domain saying the address could not be found.
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Glen KnightCommented:
And you have configured a user with an email address from that domain?

Can you send out from the domain in question?
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AndyDotNetAuthor Commented:
The 2nd domain (.co) can send and receive fine.
The 3rd domain (.co.uk) cannot send or receive.

All settings for both domains are identical (with the exception of the extension) in both Exchange and MailMarshal.

Also somthing I have noticed is that the .co.uk address has not filtered through to Active Directoy despite me having updated the RUS.

I tried manually entering the .co.uk address for a user in AD and waiting for 10 mins but still no email.

I have also tried adding the .co.uk address to the .co address recipient policy and leaving the .co as the primary address but that had the same results.
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Glen KnightCommented:
Can you post some screenshots of the recipient policies please?
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AndyDotNetAuthor Commented:
I have omitted my client's business name for security reasons but here is what I've got:
exchange-screenshot.jpg
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Glen KnightCommented:
If you highlight the .co.uk domain and select edit, is there a check in the box for exchange being responsible for this domain?
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AndyDotNetAuthor Commented:
I meant to add this to the above post:

The left-hand policy is the one which works.

The General and Details tabs have no information on them.
In the right-hand recipient policy the .co address is currently present but I have tried removing with no change in results.
I have also tried adding the .co.uk address to the first policy (on the left) with no change in results.
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AndyDotNetAuthor Commented:
Yes, the check-box is ticked for both policies.
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AndyDotNetAuthor Commented:
Sorry, it is the RIGHT-HAND policy which works!!! My bad...
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AndyDotNetAuthor Commented:
You can also see here that the .co.uk address has not filtered into Active Directory despite the check-box saying it will do so. AD User
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AndyDotNetAuthor Commented:
Still need to solve the Active Directory issue but email now works.
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