Malformed SMTP Reply Address Problem - Exchange

Hi - we have an extensive (32 sites) Domino Infrastructure and we have been tasked with setting up one Exchange Server 2003 at one site so that a group of users can use Sharepoint and the integrated Office 2003 pieces that depend on Exchange 2003. Those users will retain a person document, but they will be listed in Notes as Mail System “Other” and then given an email address of “[alias]@Exchange” - which is working now. The site is NOT where the inbound SMTP mail comes in - we have a front end SMTP service listening and routing to all 32 Domino sites, and this site is one of the 32.

We have successfully deployed this as a test, but we have one remaining problem. Facts for this example: we are OURPLACE, foreign domain EXCHANGE, inbound SMTP routes mail to SERVER1/OURPLACE and the foreign domain document knows that SERVER1 routes mail to EXCHANGE. All the plumbing works, in both directions. New mail to/from Notes users and to/from Exchange users, new mail to/from outside users from Notes, and Exchange.

Problem: a mail sent to johnny@ourplace.com (an Exchange user) from joe@someplace.com (an outside Internet user) arrives at Johnny’s inbox as joe@someplace.com@OURPLACE. So far so good, but annoying.

Then, when Johnny replies, the outside user gets a mail from johnny.Exchange@ourplace.com, instead of johnny@ourplace.com.

Then, when Joe replies to that reply, the mail goes undeliverable because Domino can’t route a mail for johnny.exchange@ourplace.com from the outside.

I have been able to determine that notes is doing the rewriting of the address, because when Johnny the Exchange user starts a new mail (not a reply) he is seen by Joe as johnny@ourplace.com. The Exchange SMTP service is set to use the head end notes server as a smart host, and I know it is using it correctly because the correct footer is getting added to the new outbound message. Also, the exchange smtp connector is set to rewrite all smtp email with the address of [alias]@ourplace.com, which it is doing fine, explaining why new messages are formed correctly (new messages route out the smtp service to our head end smtp Domino server; replied messages route using the Notes Connector and my local Domino Server accepts the message and passes it back to the head end.)

Can you help me find a way to force re-writing of a user’s smtp address on the Domino side for a certain user, so that I can just rewrite it on my (local to the exchange server) Domino server or on the head end server before it leaves my network via smtp? That should cure it. Of course, if there is a simple setting or procdure that I have overlooked, I’d rather fix it as designed. Please let me know! Thanks, Ed