exim authetication problem

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exim authetication problem

direct_logic
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Hi All,

I m using exim 4.63 , my problem is any user set different sender email address once it is authenticated. But it might be in risk for allowing the user to send outgoing bulk/spam email via authenticated SMTP with different sender email address. How can i prevent this. And how i can check authenticated ID domain with domain used by user to send email.

Thanks