Ok I went scouring through the logs trying to trace a particular message like
you suggested and I did find some like this:
Here's one message I tracked.214CA3AC88D: from=<listname-boun...@domain.com>,
size=585098, nrcpt=500 (queue active)
then214CA3AC88D: to=<n...@otherdomain.com>, relay=none, delay=32256,
delays=32255/0.05/0.15/0, dsn=4.4.1, status=deferred (connect to
mail1.otherdomain.com[x.x.x.x]:25: Connection refused
then214CA3AC88D: from=<listname-boun...@domain.com>, size=585098, nrcpt=500
(queue active)
then214CA3AC88D: sender non-delivery notification: 35F9D3AC8A5
then35F9D3AC8A5: from=<>, size=3771, nrcpt=1 (queue active)
then35F9D3AC8A5: to=<listname-boun...@domain.com>,
relay=hubtransport.domain.net[192.168.0.165]:25, delay=0.22,
delays=0.08/0.04/0.01/0.1, dsn=2.6.0, status=sent (250 2.6.0
<20140620091131.35f9d3ac...@mail1.domain.com> Queued mail for delivery)
then35F9D3AC8A5: removed
> First of all, these should be from=<listname-boun...@domain.com>, not
> from=<listn...@domain.com>. If your posts are really being sent with
> envelope from <listn...@domain.com>, that means bounces will be returned
> as list posts, not as bounces.
>
> But, I'm still not seeing what I need to see. Taking the last above
> message as an example, do
>
> grep B52323AC87E /var/log/maillog
>
> or whatever the log file is. In the last few lines, you should see one
> that says
>
> ...postfix/bounce[...]: B52323AC87E sender non-delivery notification: xxxx
>
> where xxx is another Postfix queue ID for the bounce DSN. Then grep the
> log for that Queue ID, and what do you see?
>
>
> > Here's one where it seems to send the bounced message back to ExchangeJun
> > 20 04:11:31 poseidon postfix/smtp[1539]: 35F9D3AC8A5:
> > to=<listn...@domain.com>, relay=hubtransport.domain.com[192.168.0.165]:25,
> > delay=0.22, delays=0.08/0.04/0.01/0.1, dsn=2.6.0, status=sent (250 2.6.0
> > <20140620091131.35f9d3ac...@mail1.domain.com> Queued mail for delivery)
>
>
> If this is actually a report on one of those DSNs, it should be going
> to=<listname-boun...@domain.com>, not to=<listn...@domain.com>. If the
> envelope from of your outgoing posts is really <listn...@domain.com> and
> not <listname-boun...@domain.com>, that would explain why bounces are
> being processed and it might explain what the heldmsg files are (i.e.
> bounces returned to the list and being held as non-member posts).
>
> It this is what's happening, something is rewriting the envelope sender.
> What, I have no idea.
>
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