E-Mail help please please!!!!! Urgent if possible

[joemailey]

I'm having an issue when I try to email to certain email address, I get bounce back below:
I'm running exchange 2010. I have no idea if the below is our fault or the other ends fault.
Please help me!




mail.*****.co.uk rejected your message to the following e-mail addresses:

user (user@******.co.uk)


mail.******.co.uk gave this error:
Unable to deliver to <user@******.co.uk>


Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery.




Diagnostic information for administrators:

Generating server: EXCHANGE.*****.gov.uk

user@******.co.uk
mail.********.co.uk #550 5.7.1 Unable to deliver to <user@******.co.uk> ##

Original message headers:

Received: from EXCHANGE.*******.gov.uk ([192.168.8.13]) by
exchange.******.gov.uk ([192.168.8.13]) with mapi; Wed, 10 Feb 2010 14:22:35
+0000
From: user <user@******.gov.uk>
To: user <******@******.co.uk>
Subject: Special Council Meeting - Tues 23 Feb 2010 at 2 pm
Thread-Topic: Special Council Meeting - Tues 23 Feb 2010 at 2 pm
Thread-Index: AcqqXHuqyXH0Zy/7TK6Jci6AU+7VRQ==
Date: Wed, 10 Feb 2010 14:22:32 +0000
Message-ID: <B4E37E7E00B51144B92A02D5AE15650AA41A@exchange.*** ***.gov.uk>
Accept-Language: en-GB, en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
Content-Type: multipart/mixed;
boundary="_005_B4E37E7E00B51144B92A02D5AE15650AA41 Aexchange******govuk_"

[WebFooL]

Is this the log from the "Message Tracking"?

If "mail.*****.co.uk" is the remote host SMTP server they rejected your mail.

[raditude]

Doesnt have to be the remote host if you have sender restrictions on in Exchange 2007 or 2010.

[WebFooL]

In my point of view.

"mail.******.co.uk gave this error:
Unable to deliver to <user@******.co.uk>"

that server is the one that restricts the mail from flow. If it is the remote or local have nothing to do with it. (i just assumed that it was the remote host)

[joemailey]

"mail.******.co.uk gave this error:
Unable to deliver to <user@******.co.uk>"

That is the remote host, my main concern was if it was problem my mail server(exchange 2010) it is just that I am in the middle of a migration process so I currently have Exchange 2003 server and Exchange 2010 server running at the same time.

Althou I have no issues sending email anywhere else, well at least the 20-30 users I have migrated to exchange 2010 have not reported any issue's other than this issue.

Is it safe to say it isn't my mail servers fault?

[Coutelot]

According to me it looks that the faut is on the other end.

[joemailey]

Cheers for the answers folks. Defo looks like it is there issue and not ours.