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Block recipients from the same domain

From: Alejandro Facultad (alejandro_facultadyahoo.com.ar)
Date: Tue Feb 26 2008 - 17:15:33 CST


Dear all, I have a Postfix mail server that support the "company.com.ar"
mail domain. This domain have several users:

acompany.com.ar
bcompany.com.ar
ccompany.com.ar
bosscompany.com.ar

I want that a, b and c can send messages to boss; but a, b and c can't
send messages among them.

How can I do this ??? Using blacklist or what ???

Special thanks,

Alejandro