[Gllug] Handling a new twist by spammers

[Jason Clifford]

On Mon, 9 Dec 2002, Andrew Halliwell wrote:

> > Someone has been sending a large number of e-mails to randomly generated
> > addresses, (like "fred101 at linuxemporium.co.uk",
> > "fred102 at linuxemporium.co.uk" etc.) and then sending them to the
> > *secondary* mail server.  It accepts them because it doesn't know any
> > better, then tries to pass them on, fails, tries to send them back to
> > the originator, fails again and then freezes them.
> 
> Block all mail not coming from your domain or that of the ISP's "smarthost"?

You didn't understand the nature of the problem John outlined.

The secondary mail servers are a necessity. They must be able to accept 
email for the domain from anywhere or else they are useless.

ISP smarthosts are for outgoing email.

Jason Clifford
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