I am using Exchange 2003. I have a user that is trying to contact one of our customers. Every time the user receives the following message back:
This is an automatically generated Delivery Status Notification.
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipients has been delayed.
I have checked the queues in Exchange and the users messages are still queued up.
I did some digging around here on EE and found these troubleshooting steps posted in a previous question located here: http://www.experts-exchange.com/Networking/Email_Groupware/Exchange_Server/Q_20993899.html
Try the following.
- Open a command prompt.
- Type "NSLOOKUP" and press enter.
- Type "SET TYPE=MX" and press enter.
- Type in the domain name of the address that is giving you problems. For instance, if you are trying to send to BillGates@microsoft.com, you would type "microsoft.com" and press enter.
- A list should appear. This is a list of the mail servers (DNS MX records) that are assigned to that computer.
- Look for the server name with the lowest preference number. If they are all the same preference, just use one. In our example, it is maila.microsoft.com.
- Type "exit" and press enter to quit NSLOOKUP.
- Try to ping the address.
- If successful, try to connect to the mail server manually:
- Type "telnet maila.microsoft.com 25" and press enter, substituting the appropriate server name.
- You should see a server banner message (see example).
<<< Do not make any typos on the next commands, or the commands will fail. Backspace will not usually work. If you mess up a command, press enter and type the command again. >>>
- Type "HELO" and press enter (you might not see what you type. This is normal).
- Type "mail from:<youraddress@whatever
.com>" substituting your address and press enter.
- Type "rcpt to:<firstname.lastname@example.org
m>" substituting their address
- Type "data" and press enter.
- Type "Subject: Test message" and press enter TWICE.
- Type a short message. When you are done, press enter, type a period, and press enter again to end the message.
- Type "quit" and press enter to exit.
When I attempt to telnet into their mail server I receive this message back:
550 RBL rejection: local dynamic IP address <my external IP>
Any thoughts on why these messages are not being delivered? The domain of the person we are trying to contact is northcoastindustrialmetals