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)
