At 04:51 04/24/2001 Tuesday, Michael Quinion wrote:
>
> >Understood! My query was why the passive bouncing mechanism,
> >which - if I've understood it right - tags messages with a
> >unique return address, isn't picking these up?

The remote server sometimes stripts the 'tag' before returning the bounce.

On Tue, 24 Apr 2001 10:02:14 -0400, Pete Weiss <[log in to unmask]> wrote:

>Deos the subscriber option NORENEWAL affect passive probing (I don't know).

It does.  NORENEW will turn off passive probe on a per-address basis.

>Maybe the distribution that has the passive probe is not bouncing for
>reasons unrelated e.g., a random timing issue due to a subscriber whose
>mail exchangerS are misconfigured and thus depending upon a host of
>factors only sometimes get referenced (and bounce)?

Or the address has a secondary MX and the secondary bounces, but the primary
accepts.