against outgoing spam using /usr/sbin/sendmail?

["Monty Ree" <chulmin2 () hotmail com>]

Hello, all.

I would like to set sendmail that only some allowed domains or e-mail 
address can send an e-mail to remote host using /usr/sbin/sendmail program.

So I set /etc/mail/access like this.

#localhost.localdomain           RELAY # commented 
#localhost                       RELAY   # commented 
#127.0.0.1                       RELAY   #commented 
abc.com    RELAY
zyx.com    RELAY 


and executed "makemap hash /etc/mail/access < /etc/mail/access"
Then only two domains are allowed. 
But when I send an e-mail from address is "root () spam com" at that server 
using sendmail to 
remote, I can send emails well.

What's the matter and how can I solve this problem.

Additionaly, some hosting user send lots of mails using /usr/sbin/sendmail 
from cgi program,
How can I protect normal user from sending spam mails at sendmail?
I can't delete /usr/sbin/sendmail because some normal user must send an 
e-mail.



Thanks in advance.

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