how to prevent unauthorized mail relay in postfix?

From: sam (samwun_at_hgcbroadband.com)
Date: 12/06/03

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    Date: Sat, 6 Dec 2003 23:52:27 +0800
    
    

    Dear all,

    how can I prevent mail relay from unauthorized host?
    eg. I don't want other internal user use my boss's e-mail account by using
    command "telnet xxx.com 25"...

    Thanks
    sam


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