Relay emails from SAP systems using Exchange 2007

We are required to relay emails from our SAP systems to our shareholders/customers who are all external to our network.  All automated SAP emails that are sent internally work fine, but emails from SAP to our external recipients (shareholders/customers) do not work.  There is an error referring to unknown recipient in the SAP systems SMTP mail flow transaction.  

The SAP environment has servers on a specific IP range, this range has been allowed in a new recieve connector I have created, so that the connector accepts messages from servers in this range.  

In the SAP systems the SMTP server configuration is set to point to our Hub Transport Exchange 2007 server, obviously it is working for all internal recipients and I am assured by the SAP technical team that the SMTP configuration and mail flow is all set correctly at their end.  

There must be a configuration issue which is stopping these external emails being sent out.  

If any more information is required just let me know.

Thanks in advance.
 
ishamsiAsked:
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ishamsiAuthor Commented:
One more thing - It is configured exactly as described here.

http://blogs.techrepublic.com.com/networking/?p=373 
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ishamsiAuthor Commented:
Okay figured it out.  

We have two hub transport servers the live one and the backup one.  ISA rules determine which is used.  It seems that it was the backup hub transport server which was taking these requests and the receive connector wasnt set properly on this one.  After configuring it to be the same as the primary hub transport server, it works fine.

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