#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.
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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

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.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.