>After installing Exchange 5.5 I am unable to send internet mail from
>Outlook. Mail returns with the following message:
>"The recipient name is not recognized"
>No problem sending mail, just receiving.
That's unusual. This is most often a problem with outgoing mail when
the IMS has an incorrect address space.
Can we see the NDR that's sent?
Quote:>If I add the Internet Mail Service, installed and configured pointing to the
>exchange server, all is well. But it will not work without that Service. Is
>this really necessary?
You're bypassing the Exchange server entirely and using only the SMTP
server when you do this. It's not necessary.
It also makes me think that your previous statement that the problem
happens when you receive mail is incorrect (or more likely, reversed).
If the NDR is issued by the MSExchangeMTA then it's definitely a
problem with the IMS address space.
MCSE, Exchange MVP