how to prevent local unauthorized mail relay in postfix

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

Date: Sat, 6 Dec 2003 23:53:23 +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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