Cannot receive external emails

I have one account on Exchange Server 2013 that only receives internal mail, external mail gets rejected with the following error:
Reporting-MTA: dns;DUB004-OMC1S11.hotmail.com
Received-From-MTA: dns;DUB110-W4
Arrival-Date: Fri, 27 Mar 2015 02:22:32 -0700
Final-Recipient: rfc822;<email>@<Domain>.co.uk
Action: failed
Status: 5.7.1
Diagnostic-Code: smtp;550 5.7.1 Recipient rejected (R4)
The email account appears to have the same settings as the email accounts that accept both internal and external email.

Hello,
Good Day...
Request you to please follow the below steps
5.7.1
A very common Exchange 2010 NDR, the cause is a permissions problem. For some reason the sender is not allowed to email this account.
Perhaps an anonymous user is trying to send mail to a distribution list.
Alternatively, a user may have a manually created email address that does not match a System Policy.
Check SMTP Virtual Server Access Tab. Try checking this box: Allow computers which successfully authenticate to relay.
Check the outgoing SMTP logs.
Check: Mailbox – <Mailboxname> – Properties – Mail Flow Settings – Message delivery restrictions.
Try disabling Windows-Integrated-Security. Instead allow only standard authorization on the SMTP receiver on the Exchange 2010 server.
Check Attachment filtering on the Edge server.
Also you can follow the below steps
Add the user/aliases affected by this to the User List
Found under Management tab > User Management
Change the Unknown Users setting
Found under Management > Inbound Filtering
> Spam Handling Settings > Unknown Users
NOTE: BLOCKED is the recommended option
Cause : When Unknown Users is set to block and the user is not listed in the Control Panel, then email to that user is rejected.
For More Info: http://www.techrid.com/exchange-server-2010/mailflow/exchange-server-mail-flow-troubleshooting-with-list-of-exchange-2010-ndr-codes-2/
Regards,
Praveen
Remember to mark as helpful if you find my contribution useful or as an answer if it does answer your question.That will encourage me - and others - to take time out to help you Check out my latest blog posts @ Techrid.com

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Exchange 2010: New Mailboxes cannot receive external email, but internal works fine. Existing Mailboxes are working properly.

Hello,
I can't seem to figure out what the problem is, but my new mailboxes cannot receive external email. The sender receives an NDR stating the following:
The error that the other server returned was: 550 550 No such user - psmtp (state 13).
Internally, the affected mailboxes can send and receive mail, and the mailboxes have no trouble sending mail out of the organization. I do not see an anti-spam solution installed on the exchange server, and I have confirmed that DNS resolved to the WAN IP
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On Wed, 30 May 2012 02:01:19 +0000, Relion Support Inc wrote:
>
>
>Hello,
>
>
>
>I can't seem to figure out what the problem is, but my new mailboxes cannot receive external email. The sender receives an NDR stating the following:
>
>The error that the other server returned was: 550 550 No such user - psmtp (state 13).
>
>
>
>Internally, the affected mailboxes can send and receive mail, and the mailboxes have no trouble sending mail out of the organization. I do not see an anti-spam solution installed on the exchange server, and I have confirmed that DNS resolved to the WAN
IP of this server.
>
>
>
>Can anyone help me? The message tracker didn't appear to have recorded the NDR's that it sent, but it's possible I didn't view the logs correctly.
Is your Exchange server exposed to the Internet or do you have some
3rd-party device that does spam filtering? If you have something out
in front of Exchange that only periodically refreshes its cache of
valid SMTP addresses from the AD then you need to adjust the refresh
rate.
That "550 No such user" isn't a status code that Exchange returned.
Rich Matheisen
MCSE+I, Exchange MVP
--- Rich Matheisen MCSE+I, Exchange MVP

Exchange 2010 - Cannot receive external emails, only internal.

Hello, this is my first time setting up Exchange 2010, I have set up exchange 2010 on Windows Server 2008 R2, I can receive internal emails but every time I send out an external email I get a bounce back. I have a domain controller on a separate VM I have
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Hi,
Please also check whether you have been blocked by others via following link:
http://mxtoolbox.com/blacklists.aspx
Disclaimer:
Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure
that you completely understand the risk before retrieving any suggestions from the above link.
Thanks
Mavis
Mavis Huang
TechNet Community Support

One Exchange Mailbox not receiving external email

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DustinB3403 wrote:Have you checked the settings on the account to be able to receive external email.Check herehttp://www.cryer.co.uk/brian/msexchange/exch_howto_disable_delivery.htmThere is an option on the user account to select who can send emails to this account that is likely the cause of your issues.I have checked this...
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Cannot receive external emails

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