Hi, Please consider adding option for including References header in postfix bounce messages.
Sender app (i.e. ticket processing suff like OTRS) will be happy to use it to automatically merge bounce message to the same thread as original message which may save time in bigger setups. Similar request: https://bugs.launchpad.net/ubuntu/+source/postfix/+bug/1575207 -- Regards, Pawel Boguslawski IB Development Team https://dev.ib.pl/
