Looking for ways to troubleshoot undeliverable emails............

A client gets the following when trying to email me, and I am looking for ways to troubleshoot it (have changed some info for security reasons)





Your message did not reach some or all of the intended recipients.

      Subject:  RE: Newsletter

      Sent:     31/03/2006 13:55

The following recipient(s) could not be reached:

      info@my-company-domain.co.uk on 02/04/2006 14:04

            Could not deliver the message in the time limit specified.  Please retry or contact your administrator.

            <client-dc01.ClientName.local #4.4.7>




Thanks in advance for any things to try
gump2kAsked:
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SembeeCommented:
It would help if you indicated what email server this was.

The first thing that immediately springs out is that your server is announcing itself as an invalid name. "client-dc01.ClientName.local " - in fact anything with .local will be rejected by many sites as an antispam measure.

You should also verify that your DNS and reverse DNS are configured correctly.

Then you come down to straight DNS issues.
On the email server, drop in to a command prompt and type

nslookup

press enter, then type

set type=mx

and press enter again.
Then enter the domain that you want to query

microsoft.com

and press enter.
You should get a response like this:

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 don't get a response, then either you have the wrong information or you are being blocked.
Use the tools at dnsstuff.com to see whether the wider internet can connect to the problem server - or not.

Simon.

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