We have an always_bcc setup in place for incoming mails:

recipient_bcc_maps = pcre:/etc/postfix/backup_bcc.pcre

/^(.*)@charite\.de$/            backup+${1}=charite.de@backup.invalid

Now I tried to redirect mails from my private address sent to anybody
at charite.de to be redirected to someone else in the organisation,
like this:

rxlf.hildebra...@gmail.com REDIRECT toscx.hrn...@charite.de

Now the following happened: The mails was not sent to the original
recipient (that was expected), but it also wasn't sent to
toscx.hrn...@charite.de -- but instead it went the way of the
always_bcc, but wan't delivered but bounced (according to the logs
below).

But in fact it didn't bounce (at least I didn't get anything back).

Jul 31 09:24:13 mail-cbf-int extern/smtpd[2663640]: NOQUEUE: redirect: RCPT 
from mail-ej1-f49.google.com[209.85.218.49]: <rxlf.hildebra...@gmail.com>: 
Sender address triggers REDIRECT toscx.hrn...@charite.de; 
from=<rxlf.hildebra...@gmail.com> to=<ralf.hildebra...@charite.de> proto=ESMTP 
helo=<mail-ej1-f49.google.com>
Jul 31 09:24:13 mail-cbf-int extern/smtpd[2663640]: 4WYk9n2SK3z20ycy: 
client=mail-ej1-f49.google.com[209.85.218.49]
Jul 31 09:24:13 mail-cbf-int postfix/cleanup[2659314]: 4WYk9n2SK3z20ycy: info: 
header From: Ralf Hildebrandt <rxlf.hildebra...@gmail.com> from 
mail-ej1-f49.google.com[209.85.218.49]; from=<rxlf.hildebra...@gmail.com> 
to=<ralf.hildebra...@charite.de> proto=ESMTP helo=<mail-ej1-f49.google.com>
Jul 31 09:24:13 mail-cbf-int postfix/cleanup[2659314]: 4WYk9n2SK3z20ycy: info: 
header Date: Wed, 31 Jul 2024 09:24:01 +0200 from 
mail-ej1-f49.google.com[209.85.218.49]; from=<rxlf.hildebra...@gmail.com> 
to=<ralf.hildebra...@charite.de> proto=ESMTP helo=<mail-ej1-f49.google.com>
Jul 31 09:24:13 mail-cbf-int postfix/cleanup[2659314]: 4WYk9n2SK3z20ycy: 
message-id=<CAN3ODnhTG4mAuh_2ZeqY10FXwHi0Mnqcwk==wjmiua_hed_...@mail.gmail.com>
Jul 31 09:24:13 mail-cbf-int postfix/cleanup[2659314]: 4WYk9n2SK3z20ycy: info: 
header Subject: Test an ralf.hildebra...@charite.de from 
mail-ej1-f49.google.com[209.85.218.49]; from=<rxlf.hildebra...@gmail.com> 
to=<ralf.hildebra...@charite.de> proto=ESMTP helo=<mail-ej1-f49.google.com>
Jul 31 09:24:13 mail-cbf-int postfix/cleanup[2659314]: 4WYk9n2SK3z20ycy: info: 
header To: "Ralf Hildebrandt (hildeb)" <ralf.hildebra...@charite.de> from 
mail-ej1-f49.google.com[209.85.218.49]; from=<rxlf.hildebra...@gmail.com> 
to=<ralf.hildebra...@charite.de> proto=ESMTP helo=<mail-ej1-f49.google.com>
Jul 31 09:24:13 mail-cbf-int postfix/qmgr[1615285]: 4WYk9n2SK3z20ycy: 
from=<rxlf.hildebra...@gmail.com>, size=3810, nrcpt=2 (queue active)
Jul 31 09:24:13 mail-cbf-int postfix/error[2664442]: 4WYk9n2SK3z20ycy: 
to=<toscx.hrn...@charite.de>, 
orig_to=<backup+ralf.hildebrandt=charite.de@backup.invalid>, relay=none, 
delay=0.62, delays=0.57/0.02/0/0.03, dsn=5.1.1, status=bounced (User unknown)
Jul 31 09:24:13 mail-cbf-int postfix/qmgr[1615285]: 4WYk9n2SK3z20ycy: removed

Also note that is says "nrcpt=2", but is only being delivered (sort
of) once. Postfix 3.10-20240724

I'm aware that is is some sort of bizarre edge-case.

-- 
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netz | Netzwerk-Administration
  Invalidenstraße 120/121 | D-10115 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebra...@charite.de | https://www.charite.de
            
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