Solicited sales email distribution - advice needed

[Bruno Wolff III]

On Mon, May 20, 2013 at 17:03:14 +0100,
   Gary Stainburn <gary.stainburn at ringways.co.uk> wrote:
>
>I have thought about Mailman as I've used it before for my charity work.
>However, I do think that as you say, it sends emails as groups to addresses
>with the same MX records which will not resolve my main problem.

ezmlm sends per recipient envelope-sender addresses so that bounces can 
be reliably (as much as is possible) handle bounces. This depends on some 
features of qmail in order to work. So you'd need to be using it as an MTA 
for handing these messages.

It still hides the bounces from the sender, though.