troubleshooting Question

Exchange 2003 smart host option

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nonlinearly asked on
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Hi, we have an Exchange 2003 as mail server and in the connector has been selected the option: "Forward all mail through this connector to the following smart hosts".
The smart host is the smtp server of our ISP.
Recently our ISP saint to us that this smtp is to be replaced from another. So they sent to us the new smtp address to replace the old smart host. But with the new smtp address we can not send e-mail and the exchange return this message:
Cannot send the message.  530 Authentication Required
I know that this smtp requires authentication but where in exchange can set up this?
Thanks
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