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Undeliverable message with 554 5.7.1 Helo invalid

Situation: the client receives the following Undeliverable message

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

      Subject:  Server Offline

      Sent:     9/27/2009 9:41 AM

The following recipient(s) cannot be reached:

      'blin@chicagotech.net on 9/27/2009 9:41 AM

            You do not have permission to send to this recipient.  For assistance, contact your system administrator.

            <exchsrv.chicagotech.local #5.7.1 smtp;554 5.7.1 Helo invalid .>

Troubleshooting: In most cases, this id DNS or FQDN issue. Make sure that the FQDN is not correctly set in you exchange server.

1. Open Exchange System Manager.

2. Navigate to Administrative Group>DomainName>Servers>ServerName>Protocol>SMTP.

3. In the right pan, right click on Default SMTP Virtual Server and select Properties.

4. Click on Delivery and then Advanced.

5. In our case, the FQDN is local server sbs2003.chicagotech.local.

6. Run nslookup and set type=mx. Type chiagotech.net to check the MX record which is sbs2000.chicagotech.net.

7. replace sbs2000.chicagotech.net with sbs2003.chicagotech.local

8. Click Check DNS to verify the correct settings.

9. Now, test your email again.

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