Use the Invalid Recipient Options to configure invalid recipient settings, such as allowing invalid recipients.
        
        
        
        Steps
- 
                Navigate to the page .
            
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                From the section Invalid Recipient Options, permit mail containing invalid recipients into your system; mark the check box Allow invalid recipients.
                This option is available only when the recipient validation is configured on the page . See Managing user validation/authentication options. Selection enables the corresponding text field and check box. 
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                In the text field Block message if the percentage of invalid recipients is at least, enter a value for the percentage of invalid recipients that determines
                    if a message is blocked.
                The default is 100%. 
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                Enable the system to send a non-delivery report notification; mark the check box Send non-delivery report (NDR) only if a message is not blocked.
            
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                Click OK.
                The settings are saved.