Messages in this thread | | | Date | Tue, 18 Jan 2000 18:18:40 +0200 | From | Matti Aarnio <> | Subject | Re: vger rejecting messages from mediaone (ORBS is evil) |
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On Tue, Jan 18, 2000 at 08:38:07AM -0500, Mike Porter wrote: > Most likely the problem is above.net has customers who can't > upgrade to a newer mailer that can block relaying.
So put such a system behind a ``firewall'' (which does not necessarily mean expensive things, perhaps just IP ACL at the network egress router) and divert all incoming email to do so via a bastion server by means of MX records. Trivial.
If you don't want to construct such bastion yourself, ask your ISP to act as such, and do router ACL blocking to limit incoming SMTP connectivity from your ISP's server network.
http://www.zmailer.org/smtprelay.html
If the receiving server is vulnerable to things like: <"foo@somewhere.com"@receiver.com> these ISP bastions don't help, as ISP can't analyze that the address in the local part is a cocoos egg.. (Same *may* also harm self-kept fw/bastions.)
> Mike
/Matti Aarnio
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