I have an Exchange 2003 server and I'm forwarding my outbound internet email
through an SMTP smart host, i.e. the SMTP server provided to me by the web
hosting company that holds my domain name.

The problem is that outbound authentication is different depending on the
source address the email originated from. For instance:

SMTP connector is set to Forwarld all mail through this connector to the
following smart hosts: mail.mydomain.com

Outbound Security -> Basic authentication -> User = bob@mydomain.com
(password is set up)

This is fine when bob wants to send an email, it goes through.

Unfortunately, when Jim wants to send an email from jim@mydomain.com it
bounces straight back to his client with the following error:

"Sender address rejected: not owned by user bob@mydomain.com"

Basically the web-host and controller of the SMTP smart host I'm forwarding
mail through demands that I log in with the username I'm trying to send
email from. I cannot log in with bob@mydomain.com and send email
originating from someone other than bob@mydomain.com.


Is there some way I can get Exchange 2003 to authenticate to the SMTP
smarthost with different usernames depending on who the email is from?


Thanks,
Alex

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