On Thu, Jan 28, 1999 at 11:28:45AM -0600, Chris Garrigues wrote:
> /sbin/ipfwadm -I -a accept -P tcp -S 10.0.0.0/8 -D default/0 25 -r 25
>
> Now, anything they try to send to port 25 anywhere will be intercepted by qmail
> on your firewall and you can filter it out yourselves only allowing outgoing
> mail with sender domains which belong to your customers. You aren't
> stopping legitimate SMTP traffic, you're simply keeping your customers honest.
Booooo! Are you saying that if one of your users is using an address that you
don't know about that his mail is not legitimate and that he's dishonest? What
about all those places that offer forwarding addresses, like pobox.com? You
won't relay mail for a user if he uses a pobox.com address? An organization I'm
associated with offers forwarding addresses with our domain name; lots of our
members use them. Do you consider them to be doing something wrong?
ISPs shouldn't restrict what their users can use as an envelope address.
Chris
