Failed to send to identified host, Message non-deliverable

[HerbExch]

Request your help on the best way to determine why user from my domain (Domain A) cannot send emails to users in Domain B. Users in Domain B can however send emails to recipients in Domain A. Received a NDR after 24 hours that didn't really specified the cause. Spoke with the administrator of Domain B. Checked their queues for mail with no luck. Are there any other troubleshooting step I can take? We are using Microsoft Exchange Server 2003.

Your message could not be sent.
A transcript of the attempts to send the message follows.
The number of attempts made: 1
Addressed To: firstname.lastname@DomainB.com

Wed, 19 Nov 2008 10:27:21 -0500
Failed to send to identified host,
firstname.lastname@DomainB.com: [],
--- Message non-deliverable.

 

[noveyron]

Is there an udeliverable code such as 4.4.7, 5.7.1 etc ?

 

[HerbExch]

Here is what was in a document attached to the failed delivery/send notice.

Action: failed
Final-Recipient: rfc822;firstname.lastname@DomainB.com
Diagnostic-Code: smtp;
Status: 5.0.0

 

[noveyron]

What version of Exchange are you running?

 

[HerbExch]

We are running Exchange 2003.

 

[noveyron]

Have you checked to see if you are on any blacklists?

http://www.mxtoolbox.com/blacklists.aspx

 

[HerbExch]

We are not on any blacklists. I have asked the other domain to check also.

 

[noveyron]

Anything odd in the event logs?

 

[58sniper]

More importantly, is this a recurring problem? Can ANYONE from domain A send to ANYONE on domain B?

Pat Richard MVP
Plan for performance, and capacity takes care of itself. Plan for capacity, and suffer poor performance.

http://www.ucblogs.net/blogs/exchange/

 

[VinceWhirlwind]

Get onto them manually:

http://technet.microsoft.com/en-us/library/bb123686.aspx

The rejection you get will be more informative than many NDRs.