YOu are best off posting this in an Exchange news group as it has little if anything to do with Outlook. microsoft.public.exchange.clients would be a good place to start.

--�
Milly Staples [MVP - Outlook]

Post all replies to the group to keep the discussion intact. All
unsolicited mail sent to my personal account will be deleted without
reading.

After furious head scratching, CindyLu asked:

| I removed the x400 *AFTER* I saw the entry in the event log (290)
| stating that there was an x400 error. I did put the x400 entry back
| since you wrote that its required, but I'm still baffled as to why
| the 290 error is being generated and the mail is not being sent, even
| though the connector in the routing group points to the default smtp
| server and the Address Space is SMTP with "*" for address. Does
| there need to be an x400 in the address space? I tried that too,
| using the same properties for Organization and Domain Name that I saw
| in the 290 message, but that didn't help. I don't pretend at all to
| be an Exchange expert - just the schmuck who has to have this thing
| working by Tuesday. Any ideas???