Claus Assmann:
> > With SMTP there is no per-recipiet end-of-data reply, and a
> > reject reply will block mail for all recipients.
>
> AFAICT PRDR can do that -- it's implemented in exim and some other MTA.
> However, it's barely used...
It's a chicken and egg thing; if enough systems implement PRDR then
it might be used more. I recall that we had a dispute about PRDR
Milter protocol support. I wanted to reuse existing protocol
elements and avoid implementing PRDR Milter support from scratch.
Wietse
