>We're installing a Cisco Pix firewall with "MailGuard" feature that is
>suppose to clean-up and filter SMTP commands. I am trying to verify that
>limiting SMTP to these commands will not affect our Imail Server....
>
>Here is the description of the feature:
>
>"These seven minimum-required commands are: HELO, MAIL, RCPT, DATA, RSET,
>NOOP, and QUIT. Other commands, such as KILL, WIZ, and so forth, are
>intercepted by the PIX and they are never sent to the mail server on the
>inside of your network. The PIX responds with an "OK" to even denied
>commands, so attackers would not know that their attempts are being
>thwarted."
That will work fine, until you try using SMTP authentication. If you need
to use SMTP AUTH, the Pix will play games which will make troubleshooting
very difficult.
-Scott
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