Bryan K. Walton via Postfix-users:
> On Fri, Aug 23, 2024 at 07:37:19AM +0200, Ralf Hildebrandt via Postfix-users 
> wrote:
> > 
> > > It then sent a bounce message to root's mailbox.  The bounce message
> > > included a delivery report and the undelivered message headers.
> > > However, the rest of the original email was removed.
> > 
> > Try increasing bounce_size_limit
> > bounce_size_limit = 50000
> > (default)
> 
> Thank you, Ralf.  This is very helpful.

Be sure to read the caveats for this parameter. 

* Be careful when making changes. Excessively large values will
  result in the loss of non-delivery notifications, when a bounce
  message size exceeds a local or remote MTA's message size limit.

https://www.postfix.org/postconf.5.html#bounce_size_limit

        Wietse
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