[Mailman-Developers] before next release: disable backscatter in default installation

[Kenneth Porter]

On Tuesday, March 04, 2008 12:30 PM -0800 Jo Rhett 
<jrhett at netconsonance.com> wrote:

> 1. Don't create backscatter aliases for subscribe/unsubscribe/etc by
> default.  Nearly everyone uses web based signup.
>
> 2. Discard or hold messages from non-subscribers by default.

How, exactly, does one do these? In particular, how do you remove the 
aliases when using mm-handler to process mail from sendmail? (I'd be happy 
to start the wiki page once I have the information to put there.)