#5.1.1 when sending email

I have 2 exchange 2003 servers, installed on windows 2003. two different sites. Site 1,  is my incoming mail server  for external mail but also hosts user mailboxes.
I started recieving ndr's when sending mail (from external) to certain users (three to be exact) saying: "The e-mail account does not exist at the organization this message was sent to.  Check the e-mail address, or contact the recipient directly to find out the correct address.
            <site1servername.ADS.LOCAL #5.1.1>.

Internal mail works fine, plus the 3 users that are not recieving mail can send external mail. I checked the message tracking and the NDR gets generated right after catogorizing "message categorized and queued for routing" "NDR Generated"
I also created two new users, one on each server, both of them also generate NDR's. For one of the said users I removed the exchange attributes and reconnected the mailbox after I ran the cleanup agent. I'm at a loss as to where the problem lies.
Nightfearz23Asked:
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BBRazzCommented:
It sounds like a corrupt recipient Policy.

can i suggest ensuring that the recipient policy is in tact, and has the external domains listed.

You might want to check the users properties in AD and ensure that External Email Addresses are listed in here.

Also, ensure the "Update Email Addresses based on recipient Policy" is ticked.

Now, update and run the Recipient policy

-BBRazz
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Nightfearz23Author Commented:
It turned out to be an old Root domain controller that was switched back on again. It had all the fsmo rolls assigned to it. what i dont understand is why it would effect exchange, as nothing in exchange have reference to this server anymore. but as soon as I shut it down, everything started working. I have subsequently demoted that server and removed it from the domain completely, the previous administrator did not. but anyway thanks for the response.
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