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Undeliverable mail: all relevant MX records point to non-existent hosts

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Undeliverable mail: all relevant MX records point to no... - 9.Apr.2008 12:00:13 AM   
flapjack

 

Posts: 79
Joined: 20.Aug.2005
From: Colorado Springs, Co
Status: offline
I'm having a problem where email is not being delivered 100% of the time.  At first, I thought it had to do with a crappy DSL connection.  With that resolved, I'm not so sure that's the issue anymore.

The domain is setup as a single Exchange 2007 server hosted on a dedicated business DSL line.  The DNS is hosted at Zone Edit, which I've never had a problem with.

Right now, I'm trying to figure out if it's a connection issue, or a domain/DNS issue.  I've never seen this message before, though:

-----------------------------------------------------------------
Mail delivery failed: returning message to sender

This message was created automatically by mail delivery software.
 
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
 
user@domain.com
    all relevant MX records point to non-existent hosts
------------------------------------------------------------------------
Post #: 1
RE: Undeliverable mail: all relevant MX records point t... - 9.Apr.2008 9:18:21 AM   
uemurad

 

Posts: 8232
Joined: 7.Jan.2004
From: California, USA
Status: offline
Whatever MX records the DNS query returns isn't valid.  The first place I'd check is your DNS settings for your NIC.  Where are you getting your DNS information from?  This is separate from where your own DNS information is hosted.  Are you pointing to an internal or external DNS server?

Second, for one of the domains that fails, use NSLookup to see what MX records are returned, then try to connect via telnet sessions on port 25 to see if any of them are answering.

It could also be that you have some cached lookup information that isn't being updated.  Use the /flushdns parameter with IPconfig and see if that helps.

_____________________________

Regards,

Dean T. Uemura
Microsoft MVP - Exchange (2007-2011)
exchangeguy.blogspot.com
uemurad@yahoo.com

(in reply to flapjack)
Post #: 2
RE: Undeliverable mail: all relevant MX records point t... - 9.Apr.2008 1:38:48 PM   
flapjack

 

Posts: 79
Joined: 20.Aug.2005
From: Colorado Springs, Co
Status: offline
I figured it out last night.  Turns out I had "Exchange Server authentication" under the receive connectors in the Authentication tab.  I figured it out when I realized outside domains like Yahoo and Gmail were delivering just fine. 

I unticked the box and the problem went away.  Thanks for the suggestions. 

(in reply to uemurad)
Post #: 3

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