Unable to relay when using Exchange 2007 as SMTP server

[Miha]

Hi,

we have an internal application which needs to send mail to external e-mail
addresses. I've configured the application to use Exchange 2007 to send the
mail as SMTP server. This Exchange server has HUB, Transport and CAS roles
installed. However, the application reports it cannot send mail due to the
following error:
SMTP response: unable to relay How can I configure Exchange 2007 so that it
accepts mail from the internal application and relays it externally ?
On receive connector I have enabled Anonymous users?
Any ideas ?
Regards,Miha

[Mark Arnold [MVP]]

Post by Miha
Hi,
we have an internal application which needs to send mail to external e-mail
addresses. I've configured the application to use Exchange 2007 to send the
mail as SMTP server. This Exchange server has HUB, Transport and CAS roles
installed. However, the application reports it cannot send mail due to the
SMTP response: unable to relay How can I configure Exchange 2007 so that it
accepts mail from the internal application and relays it externally ?
On receive connector I have enabled Anonymous users?
Any ideas ?
Regards,Miha

Just because you have enabled anonymous access has nothing to do with
relaying through it. Anonymous will enable submission but not relay.
Have you looked at:
http://technet.microsoft.com/en-us/library/bb232021.aspx