> I am having a problem with a Exchange 2003 server that is also a POP3
> server. I have configured Outlook express to use the POP3 server to
> retrieve emails.  When I am using a OE client local to the Exchange
> server everything seems to work fine and I can send and receive email to
> local and remote email addresses.
> When I use a OE client that is not local to the Exchange server I can
> receive email, but not send. The error I receive is:
>
> The message could not be sent because one of the recipients was rejected
> by the server. The rejected e-mail address was
> 'some***@othercompany.net'. Subject 'test', Account: 'Frank', Server:
> 'mail.localcompany.com', Protocol: SMTP, Server Response: '550 5.7.1
> Unable to relay for some***@othercompany.net', Port: 25, Secure(SSL):
> No, Server Error: 550, Error Number: 0x800CCC79
>
> On the OE client I have checked "My server requires authentication",
> which seems to clear up this issue for many people, but I am still
> receiving the error.
> On the Exchange server under the "Default SMTP Virtual Server" I have
> checked the "Allow all computers which successfully authenticate to
> relay, regardless of the list above"
> The Authentication is set for 'Anonymous Access', 'Basic authentication'
> and 'Integrated Windows Authentication"
>
> If I set up an open relay I am able to send email from a remote
> location...So I think there is something I'm missing with the client
> authentication. Is there someway to verify my authentication is working.
> Any help is appreciated
>
> Thnx
> Frank