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against outgoing spam using /usr/sbin/sendmail?

Subject: against outgoing spam using /usr/sbin/sendmail?
Date: Fri, 20 Aug 2004 07:45:24 +0000
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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