Turn off Name Not Found in Address Book Message.

Right now if someone sends an email to an invalid address in my domain, our email server sends a email from postmaster to the person who sent it telling them the user is not in the address book, can this be turned off ?
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No. It is not so easy to tweak this message. This is Notes in-built feature.

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You can reject the message during the SMTP connection and not let it get to this point. In the Configuration document, Router/SMTP, Restrictions and Controls, SMTP Inbound Controls tab You can enable the setting "Verify that local domain recipients exist in the Domino Directory". That way if it's a fake address your SMTP service won't acept the email returning a 550 error.
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