[exim] How do I block senders at SMTP? (MAIL FROM:)

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Author: Sub Zero
Date:  
To: exim-users
Subject: [exim] How do I block senders at SMTP? (MAIL FROM:)
Hi,

How can I block senders via their "MAIL FROM:" input and give lets say 4xx
or 5xx at the SMTP communication level?

    > EHLO asd
    < 2xx xxxxxxxx
    > MAIL FROM:<from@???>
    < 5xx xxxxxxxxx...


PS1: I know this could be against some RFC yadda yadda's.... :)

PS2: domain1.dom is not a local domain.