Unable to Recieve External E-Mails.Error 550 5.1.1

Hi there

I am running Exchange 2007 on a Windows 2003 Server. I recently created a user in the domain with a mailbox in Exchange. The user is sending external mail alright but can not receive from outside the organisation. Even when I reply to his sent mail to my hotmail account I get an error message indicates the following

I'm afraid I had problems forwarding your message. Full details follow:
 
Subject: 'RE: Test'
Date: 'Tue, 14 Oct 2008 13:56:15 +0400'
 
1 error(s):
 
SMTP Server <x.x.x.x> (Which is the IP address of our server) rejected recipient <username@domain.com> (Error following RCPT command). It responded as follows: [550 5.1.1 <username@domain.com>: Recipient address rejected: User unknown]
 
I have also attached the mail's original headers. Sorry it didn't work out.

I have asked somebody and he said there must be something wrong with the recipient_access not working. But I did not understand

Thanks
mustafaosmanAsked:
Who is Participating?
 
DocCan11Connect With a Mentor Commented:
I am sorry I lost this thread.. found it and will respond quickly all this week

first... do you know how to send an email to your exchange server using telnet? If you do we can use this to help test that is going on..

from command prompt type:

telnet name_of_exchange_server 25
ehlo
mail from: any_valid_email_addy
rcpt to: the_problem_email_addy

(at this point you should get an error indicating the problem.. if not continue typing)

data

this is a sample message (you can type whatever you want.. remember backspace does not work here or above so take your time typing)
. ( dot on single line indicated end of message)

quit

You are now done..  tell me what error message if any occurs.. I can then help you track which rule is blocking

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DocCan11Commented:
Are you using an Edge server?... If you are it is possible the information about the new user has not made it to the ADAM database yet..

If not you should check your rules.. it is possible you have a recipient rule that is blocking this user somehow..
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mustafaosmanAuthor Commented:
The user was created in the same way as everybody else about 5 days ago. as I said he can send but not get e-mails externally. How do I check my rules.

Thanks
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DocCan11Commented:
are you using an edge server role?

Was the user created in a different OU than the others?
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mustafaosmanAuthor Commented:
I am using a Hub Transfer Rule.

No the user was created in the same OU
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DocCan11Commented:
could you upload a screen shot of the rule.. I think this may be your issue..

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mustafaosmanAuthor Commented:
I would but I am new to Exchange 2007. Where should I go to do it
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