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Exchange 2007 unable to relay for additional domain (550 5.7.1 Unable to relay)

Posted on 2009-04-01
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Last Modified: 2012-05-06
We currently have a single 2007 exchange server that is setup to receive from multiple domains.
a.com
b.com
c.com  etc

All of these are Authoritative and work fine. We've since added another domain d.com yet we can't recieve email to it and get a 550 5.7.1 Unable to relay NDR.

The Hub transport connectors are default (Client/Default) and anonymous is checked for both. It's all fairly standard and is setup with SMTP * as default.

Can't see where this is going wrong unfortunately, the troubleshooting assistant returns with Mail submission failed: Error message: The SMTP host was not specified..

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Question by:v0r73x
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by:Akhater
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is d.com also set as authoritative ?

who is giving back the unable to realy errors the exchange server itself ?

can you paste an NDR?

Do you have the same problem sending to that domain internally?
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by:v0r73x
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d.com is Authoritative.

Users trying to send from external domains are receiving the NDR (e.g. hotmail.com to d.com)

Users emailing internally are ok (e.g. a.com to d.com)
Delivery has failed to these recipients or distribution lists:
 

user1@d.com

Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.
 

The following organization rejected your message: mail.a.com.
 
 

--------------------------------------------------------------------------------

Sent by Microsoft Exchange Server 2007 
 
 
 
 
 
 

Diagnostic information for administrators:
 

Generating server: server.a.local
 

user1@d.com

mail.a.com #550 5.7.1 Unable to relay ##
 

Original message headers:
 

Received: from server.a.local ([fe80::f5b6:8710:75f0:9541]) by

 server.a.local ([fe80::f5b6:8710:75f0:9541%10]) with mapi; Wed,

 1 Apr 2009 09:52:21 +0100

From: Administrator <admin@a.com>

To: "user1@d.com" <user1@d.com>

Date: Wed, 1 Apr 2009 09:52:20 +0100

Subject: Test 3

Thread-Topic: Test 3

Thread-Index: AQHJsqcqIb72fTttNUGnCw7hZyCCVw==

Message-ID: <9B88EAB36D968B49A8F62442E550464F85D4FA8C8F@server.a.local>

Accept-Language: en-US, en-GB

Content-Language: en-GB

X-MS-Has-Attach:

X-MS-TNEF-Correlator:

acceptlanguage: en-US, en-GB

Content-Type: multipart/alternative;

	boundary="_000_9B88EAB36D968B49A8F62442E550464F85D4FA8C8FMservera_"

MIME-Version: 1.0

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by:Akhater
Comment Utility
Can you try to send an email by telnet & check what exchange will "say"

telnet mail.a.com 25
ehlo
mail from:a@gmail.com
rcpt to:user@d.com
----- do you get an error at this point?---
data
test
.
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Author Comment

by:v0r73x
Comment Utility
Unfortunately I just get 550 5.7.1 Unable to relay after I enter the rcpt to:user@d.com etc
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Expert Comment

by:Akhater
Comment Utility
well then exchange is not seeing itself as authoritative of that domain

can you double check in the list of accepted domains ?
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by:v0r73x
Comment Utility
I can guarantee 100% they are in the accepted domains list, hence the EE post :)

I've not restarted any services so wondering if that may help refresh anything?
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Akhater earned 500 total points
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Well I have never seen this happening on exchange 2007 before sorry if i was skeptical  :o)


Usually there is nothing to restart but you can try restarting the transport service to see if it helps


Do you have any error in the event log ?
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Expert Comment

by:Akhater
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if you try a Get-ReceiveConnector | fl

can you paste the result, it might be a permission error or something
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by:Akhater
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sorry for the multiple posts but you have intrigued me

Replace the above command by

Get-ReceiveConnector "ReceiveConnector" | Get-ADPermission -user "NT AUTHORITY\Anonymous Logon" | fl
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Author Comment

by:v0r73x
Comment Utility
Have restarted the transport service and that seems to have resolved it! Bit odd so will add a few more domains and test as usually it works straight away :S Thanks for the input!
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Expert Comment

by:Akhater
Comment Utility
yes i don't recall I have ever restarted the transport service this is odd in fact

glad to know it fixed it and sorry i wasn't of any help
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Expert Comment

by:luckyhorse
Comment Utility
i had the same problem and restarting the transport service fixed also.  cheers.
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