On Wed, 8 Aug 2018 at 07:39, Dominic Raferd <domi...@timedicer.co.uk> wrote:
> I would like to be able to see an example of a double-bounce message > generated by my postfix (3.3.0) server. Can I get my postfix to send me > (say to an unrelated external mailbox) a double-bounce message? > Alternatively is there a way I can save, on the server, the double-bounce > message as and when it sends it to a third party? (These messages are not > saved locally by setting always_bcc.) > > A concern I have is that qmgr records the double bounce message as coming > from <> - which seems odd: > > 2018-08-08 08:04:41 vps344444 postfix/bounce[28259]: 059F147CEF: sender > non-delivery notification: 0C89547CF1 > 2018-08-08 08:04:41 vps344444 postfix/qmgr[20724]: 059F147CEF: removed > 2018-08-08 08:04:41 vps344444 postfix/qmgr[20724]: 0C89547CF1: from=<>, > size=4973, nrcpt=1 (queue active) > Sorry I have now found an example of a bounce message so the original part of my question is no longer relevant. The bounce message sender is indeed '<>', and the From header is 'MAILER-DAEMON@[mydomain]'. My problem with this is that although the message is DKIM-signed (by opendkim), it fails DMARC alignment because of the mismatch between sender and 'From:' header. The only related non-default settings I have are: main.cf: canonical_maps = hash:/etc/postfix/canonical inline:{$double_bounce_sender@ $myhostname=double-bounce@$mydomain} canonical: <> root www-data root postfix root root@localhost root Maybe the inline table rewriting is not working? I would expect both the sender and the 'From:' header to be double_bounce@[mydomain]