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Emails not being routed due to MX lookup failure
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Emails not being routed due to MX lookup failure - 8.Nov.2006 9:32:37 AM
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AdamAtAppiam
Posts: 9
Joined: 11.Oct.2006
Status: offline
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When trying to send emails to a particular domain all my users are getting the message returned with the following statement
This is the sender program at **mydomain**.com.
I am sorry I wasn't able to deliver your message. See reason below.
Error: delivery failed
**user**@**domain.com** - Permanent Failure: MX Lookup failed: error looking up IP for host **recipient IP address**
Running Exchange 2003 with no external DNS servers configured. Any ideas?
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RE: Emails not being routed due to MX lookup failure - 8.Nov.2006 9:37:10 AM
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ACH
Posts: 85
Joined: 13.Oct.2006
From: Chicago IL
Status: offline
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Try an nslookup on the domain and check for an MX record - if that exists, see if you can resolve the server name to an IP address.
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RE: Emails not being routed due to MX lookup failure - 8.Nov.2006 9:42:59 AM
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jchong
Posts: 2516
Joined: 1.Dec.2005
From: Centreville, Virginia
Status: offline
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Enter that domain name in checkdns.net if will report if their mail server is accepting mail.
http://www.checkdns.net/quickcheckdomainf.aspx
_____________________________
James Chong
MCSE | M+, S+, MCTS, Security+
msexchangetips.blogspot.com
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RE: Emails not being routed due to MX lookup failure - 8.Nov.2006 9:43:21 AM
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AdamAtAppiam
Posts: 9
Joined: 11.Oct.2006
Status: offline
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The NS lookup results on the domain name point to the server where the emails are hosted from. Also when pinging the mail.domainname.com it also returns the same IP address. For some reason the email address will except mail from all other accounts apart from this one.
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RE: Emails not being routed due to MX lookup failure - 8.Nov.2006 9:47:22 AM
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AdamAtAppiam
Posts: 9
Joined: 11.Oct.2006
Status: offline
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quote:
ORIGINAL: jchong
Enter that domain name in checkdns.net if will report if their mail server is accepting mail.
http://www.checkdns.net/quickcheckdomainf.aspx
The mail server is working fine, I can send to the account from other accounts, just having trouble with one
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RE: Emails not being routed due to MX lookup failure - 8.Nov.2006 11:11:38 AM
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uemurad
Posts: 8232
Joined: 7.Jan.2004
From: California, USA
Status: offline
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Are you running NSLOOKUP on the Exchange mailbox server? Is the DNS server that responds inside your environment, or is it external to your environment?
What happens if you telnet to the name? What happens if you telnet to the address?
_____________________________
Regards,
Dean T. Uemura
Microsoft MVP - Exchange (2007-2011)
exchangeguy.blogspot.com
uemurad@yahoo.com
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RE: Emails not being routed due to MX lookup failure - 8.Nov.2006 11:20:34 AM
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AdamAtAppiam
Posts: 9
Joined: 11.Oct.2006
Status: offline
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Are you running NSLOOKUP on the Exchange mailbox server? Yes
Is the DNS server that responds inside your environment, or is it external to your environment? Its internal- 192.168.1.2 I believe
What happens if you telnet to the name? Password prompt comes up
What happens if you telnet to the address? Password Prompt comes up
Thanks for the continued support!
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RE: Emails not being routed due to MX lookup failure - 8.Nov.2006 11:45:53 AM
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jchong
Posts: 2516
Joined: 1.Dec.2005
From: Centreville, Virginia
Status: offline
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Can you verify that you have your FQDN set in your SMTP VS?
1. Open Exchagne System Manager. Navigate to Administrative Groups, Site, Servers, Servername, Protocols, SMTP, Default SMTP Virtual Server,
2. Highlight Default SMTP Virtual Server, right click properties.
3. Go to the Delivery Tab, and click Advanced Button.
4. In the "Fully-qualified domain name: field, enter your fully qualified external domain name. Click Check DNS to verify that it resolves.
5. Restart SMTP service.
_____________________________
James Chong
MCSE | M+, S+, MCTS, Security+
msexchangetips.blogspot.com
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RE: Emails not being routed due to MX lookup failure - 8.Nov.2006 11:47:54 AM
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uemurad
Posts: 8232
Joined: 7.Jan.2004
From: California, USA
Status: offline
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The DNS server address you list is internal (private address). What type of system resides at that address? Is it a Windows server? A router? A firewall?
Just to confirm, when performing the telnet tests, you're forcing the session on port 25, correct?
In other words:
telnet mxrecordname.domain.com 25
telnet xxx.xxx.xxx.xxx 25
_____________________________
Regards,
Dean T. Uemura
Microsoft MVP - Exchange (2007-2011)
exchangeguy.blogspot.com
uemurad@yahoo.com
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RE: Emails not being routed due to MX lookup failure - 8.Nov.2006 11:56:49 AM
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AdamAtAppiam
Posts: 9
Joined: 11.Oct.2006
Status: offline
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quote:
ORIGINAL: jchong
Can you verify that you have your FQDN set in your SMTP VS?
1. Open Exchagne System Manager. Navigate to Administrative Groups, Site, Servers, Servername, Protocols, SMTP, Default SMTP Virtual Server,
2. Highlight Default SMTP Virtual Server, right click properties.
3. Go to the Delivery Tab, and click Advanced Button.
4. In the "Fully-qualified domain name: field, enter your fully qualified external domain name. Click Check DNS to verify that it resolves.
5. Restart SMTP service.
That is all fine...'The domain name is valid'
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