Rejecting Unauthenticated mail from local domains

Hi,
My users connect to my mail gateway to relay their mails using SMTP AUTH. This is working fine.
Now, i want to make sure that when I see From: header containing my local domain and SMTP AUTH is not used, i want to reject the mail.
I am thinking the following line would do it if added to FROM_ACCESS section of my MAPPINGS on gateway. I want to be certain before I test this as I will have to test this during a downtime and my duration would be rather short. Please help.
FROM _ACCESS
*|SMTP|*|tcp_local|*+*@mydomain.co.in| $Y
*|SMTP|*|tcp_local|*|$2* $Y
*|SMTP|*|tcp_local|*+*@*|$2*@$4* $Y
*|SMTP|*|tcp_local|*|* $Y$K$3
Will this do the job? I am running 5.2sp2

Sorry..that was wrong...here it is..
FROM _ACCESS
*|SMTP|*|tcp_local|*+*@mydomain.co.in| $NLogin$ to$ send$ mail
*|SMTP|*|tcp_local|*|$2* $Y
*|SMTP|*|tcp_local|*+*@*|$2*@$4* $Y
*|SMTP|*|tcp_local|*|* $Y$K$3

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Rejecting Unauthenticated mail from local domains

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