Microsoft KB Archive/169640

= XFOR: All Outbound IMC Mail NDRs: We do not relay =

Article ID: Q169640

The information in this article applies to:


 * Microsoft Exchange Server, versions 4.0, 5.0

SYMPTOMS
You cannot send Simple Mail Transfer Protocol (SMTP) mail to any SMTP domain name. You may receive a non-delivery report (NDR) about two minutes after you send the mail message, which reads:

Your message did not reach some or all the intended recipients The following recipient could not be reached. The recipient name is not recognized. Microsoft Exchange:IMS:Nwggsc.org:nwggsc.org nt4_NWggsc(0000B0981) 751 twili => We do not relay This problem may occur in a new installation or in a working environment after some changes have been made.

RESOLUTION
1. Check the configuration of the Internet Mail Connector (version 4.0) or

Internet Mail Service (version 5.0). If possible, change the Message Delivery To setting to "Forward all messages to host" instead of "Use DNS," and enter the IP address of the Send Mail host to avoid complications with Domain Name Service (DNS). 2. Confirm that the Exchange Server computer can successfully ping the Interent

Service Provider (ISP) host using the IP address. 3. Use the NSLookup utility to confirm the domain name, MX record, and the A-

record. 4. Telnet to port 25 of the ISP's Mail server to verify that the ISP host is

accepting communication to port 25. 5. Confirm that the IP address of the ISP really is of the same domain name it

is supposed to connect to. In one instance of this error, the administrator was pinging the old IP address of his ISP. This address was changed and the new host did not accept his mail and returned the "We do not relay" error message. This problem was encountered when using an MSDN connection to an ISP. In One circumstance the IMC worked for months, but the same problem can also happen in a new installation.

Keywords         : XFOR Version          : 4.0,5.0 Platform         : winnt Issue type       : kbprb