Read http://www.faqs.org/rfcs/rfc1894.html (honestly, read the first few
pages at least).
Basically it tries to solve issues that VERP does not. It doesn't solve the
bouncing issue as well as VERP, but it tries to establish a standard way to
communicate between MTAs and MUAs about whether a message has been
successful and, if it was not, why and according to which MTA.
> Peter van Dijk wrote:
>
> > On Mon, Sep 25, 2000 at 09:34:27AM +0200, Olivier M. wrote:
> > > As seen on freshmeat.net this morning...
> > > Any chance so see such improvments to qmail comming?
> >
> > No, because DSN is not an improvement. It's a bug. It is a misdesigned
> > fix for a problem that can be solved much better with VERP.
>
> What is DSN, anyway? Can someone explain?
