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Re: 4xx responce from a remote delays *all* mail to that host?

On 13-Mar-00 at 13:52, Matti Aarnio (mea@nic.funet.fi) wrote:
> On Mon, Mar 13, 2000 at 12:47:06PM +0300, Eugene Crosser wrote:
> > I noticed that currently (CVS version) if zmailer gets 4xx code while
> > trying to deliver any message to a remote relay, then *all* mail
> > queued to the same relay gets delayed.  It it intentional?  It seems
> > to cause unwanted results: these days many MTAs respond 45x if they
> > cannot resolve domain in MAIL FROM:.  So, if for some reason a
> > message with such unresolvable from domain appeares in the queue,
> > all mail to the same relay is hold.  Any comment?
>      It is semi-intentional.
>      Well, not quite.
>      Intention was to spend as little effort on poorly responding
>      systems as possible, but the way to signal connection failure
>      and MAIL FROM 4** are too similar :-/

Well, OK, any advice then?  Or plans to change this?