CentOS - Mar 2008 - Sendmail novrfy filter by ip address?

I have a virus and spam filter device that can do VRFY commands to
reject invalid email before it gets to the next mail hop.  How can I
configure the SMTP server to only allow VRFY commands from one
particular IP address, and nowhere else?  I don't want spammers to be
able to hammer on the gateway looking for valid addresses to send to.

on 3-25-2008 7:18 AM Sean Carolan spake the following:
> I have a virus and spam filter device that can do VRFY commands to
> reject invalid email before it gets to the next mail hop.  How can I
> configure the SMTP server to only allow VRFY commands from one
> particular IP address, and nowhere else?  I don't want spammers to be
> able to hammer on the gateway looking for valid addresses to send to.
Block the outside world from reaching anything but the filter by firewall or 
other means. Otherwise the spammers will find it and go around your filter.

-- 
MailScanner is like deodorant...
You hope everybody uses it, and
you notice quickly if they don't!!!!

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>  Block the outside world from reaching anything but the filter by firewall
or
>  other means. Otherwise the spammers will find it and go around your
filter.
I think this will probably work.  I believe this server does not need
to be open to the 'net.