We have a user on an Exchange 2003 server that cannot receive external mail. He is receiving internal mail no problem but when anyone tries to send from outside the organisation they receive a undeliverable report with the text of 'invalid recipient'.
We have tried deleting this users account and then recreating but still the problem occurs. I have had a look in the event log on the exchange server and we have the following message listed there.
"Received error while processing address space. Examine the connector with this address space and make sure it is legal. If unsure, delete it and recreate via UI. This should ensure it is correct. Address Space = (X500:/o=/ou=kdclondon/*) Hr = c0040385"
Does anyone have any ideas?