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problem sending mail to domain

Posted on 2007-04-04
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Last Modified: 2008-01-09
I am running exchange server 2003 SP2.  When we try to send a message to one particular domain we get the following error.  I tried sending a message to the email address from my gmail and did not get a return.  Why would this only be a problem from our corporate mail senders?

The following recipient(s) could not be reached:

      name@domain.com on 4/4/2007 8:02 AM
            No route was found for the recipient server.  Please contact your system administrator.
            <server.domain.com #5.4.4>
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Question by:pearlvision
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5 Comments
 
LVL 104

Expert Comment

by:Sembee
ID: 18850986
The error means what it says - your server cannot find a route to the domain.
That will often mean the problem is with your ISP.

You can confirm that by seeing if you can telnet or tracert to the host listed in the domain's MX records. Lookup the mx records in nslookup on the server...

For example... microsoft.com:

C:\>nslookup
Default Server:  server.domain.co.uk
Address:  192.168.1.1

> set type=mx
> microsoft.com
Server:  server.domain.co.uk
Address:  192.168.1.1

Non-authoritative answer:

microsoft.com   MX preference = 10, mail exchanger = mailc.microsoft.com
microsoft.com   MX preference = 10, mail exchanger = maila.microsoft.com
microsoft.com   MX preference = 10, mail exchanger = mailb.microsoft.com

maila.microsoft.com     internet address = 131.107.1.7
maila.microsoft.com     internet address = 131.107.1.6
mailb.microsoft.com     internet address = 131.107.3.123
mailb.microsoft.com     internet address = 205.248.102.77
mailc.microsoft.com     internet address = 205.248.102.78
mailc.microsoft.com     internet address = 205.248.102.79
>

When you have the MX server information, see if you can telnet to port 25 of the remote server.

For example (using the above information)
telnet maila.microsoft.com 25

If you get the route issue, do a tracert, so using the above example

tracert maila.microsoft.com

If there is a route issue the traffic will die at some point - when you will need to speak to your ISP.

Simon.
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Author Comment

by:pearlvision
ID: 18852801
no matter what domain i try I get connection failed when trying to telnet.  I am using the command:

Telnet mail.domain.com 25

and still getting connection failed.  what am I doing wrong?
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LVL 104

Accepted Solution

by:
Sembee earned 250 total points
ID: 18853501
If all domains fail then the traffic is being blocked.

I have seen that caused by antivirus before, but it could also be your firewall or your ISP. As you are trying to troubleshoot a single provider, I doubt the last two, so I would suspect that something is stopping you from using telnet - McAfee Enterprise and some versions of Symantec have that "protection".

Simon.
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