Smtp Authentication - Howto

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Hi all
I'm an IBM Domino administrator.But i have to fix an exchange 2003 server in these days.The problem is; the exchange server was full of spam yesterday because of open relay, i deleted all the spam.Now i want to make an smtp authentication setting on the exchange server.
the schema is as that:
1 MS 2003 server (domain controller) with exchange 2003 installed (all fixpacks are included) (192.168.0.1).15 clients (winXP+Outlook 2000/XP/2003 mixed).
network adress is 192.168.0.0/24
all the computers access to internet by a dsl router (192.168.0.254), using 192.168.0.1 as DNS server.
some Outlooks use "exchange" type for conecting to exchange server, some of the outlooks use pop/smtp type connection.
the domain of the company is mycompany.com.
i want all the mails (from internet or inside company) to the @mycompany.com can be delivered.but i want exchange server to ask for password when somebody (from internet or inside company) wants to send email to other domains except mycompany.com.
how can i do this? i need a simple cookbook.
thank you.
.




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