On Mon, Jan 14, 2002 at 06:29:24PM +0100, Morten Brix Pedersen wrote:
> * Alan Hodgson <ahodgsonsimkin.ca> [2002-01-14 17:39:18]:
> > On Mon, Jan 14, 2002 at 01:48:17PM +0100, Morten Brix Pedersen wrote:
> > > The question is; how should we do filtering on the e-mails? It's also
> > > important that the e-mails that are not mailer demons, are still being
> > > sent to the person.
> >
> > Use VERP-style envelope sender addresses for the mailings. Feed the
> > bounces directly to a 'bot that removes them from your database.
>
> Please explain more in depth, I have no experience with Mailman
> whatsoever - what is a VERP-style envelope?
>

A VERP envelope sender encodes the destination E-mail address into the
envelope sender address of each message as it goes out. Since you control
the format of these addresses, you control where bounces will be received
and can construct a utility to process them.

My experience with this technique is limited to Qmail and ezmlm (as well as
some home-built tools), but I have heard that Postfix has some VERP support
(sorry I'm pretty new to Postfix, mostly on the list to evaluate it for
future use). I have no idea about Mailman. Certainly VERPs are the most
reliable mechanism I know of for processing list bounces, though, and you
should look into their use if possible.

-- 
"He who controls the present controls the future; he who controls the
future controls the past." -- George Orwell in "1984"
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