On Sat, Nov 06, 2021 at 07:00:12PM -0400, post...@ptld.com wrote:
> > My expectation is that dovecot is not involved in this issue, but I'm
> > not sure, so I mention anyway that that I have set
> > 
> >     virtual_transport = dovecot
> 
> 
> Dovecot has the same setting: recipient_delimiter = +
> In the logs, is the mail being rejected by postfix or by dovecot
> after postfix tries to deliver?

I'm not 100% sure: I suspect dovecot because the error occurs talking
on the pipe to dovecot.

  postfix/smtpd[3889975]: connect from mail-pg1-f171.google.com[209.85.215.171]
  postfix/smtpd[3889975]: Trusted TLS connection established from 
mail-pg1-f171.google.com[209.85.215.171]: TLSv1.3 with cipher 
TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature 
RSA-PSS (2048 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) 
client-digest SHA256
  postfix/smtpd[3889975]: A0BCEA0FEB: 
client=mail-pg1-f171.google.com[209.85.215.171]
  postfix/cleanup[3889978]: A0BCEA0FEB: 
message-id=<CA+_EX49q_CXxH=ySLOPb92_0hOBfZczEsqr6wg0a4eJzaJ=v...@mail.gmail.com>
  opendkim[1558227]: A0BCEA0FEB: mail-pg1-f171.google.com [209.85.215.171] not 
internal
  opendkim[1558227]: A0BCEA0FEB: not authenticated
  opendkim[1558227]: A0BCEA0FEB: DKIM verification successful
  opendkim[1558227]: A0BCEA0FEB: s=20210112 
d=example-com.20210112.gappssmtp.com a=rsa-sha256 SSL 
  postfix/qmgr[3695772]: A0BCEA0FEB: from=<j...@example.com>, size=3753, 
nrcpt=1 (queue active)
  postfix/pipe[3889979]: A0BCEA0FEB: to=<jeff...@p27.eu>, relay=dovecot, 
delay=0.2, delays=0.18/0.01/0/0.02, dsn=5.1.1, status=bounced (user unknown)
  postfix/cleanup[3889978]: CE95FABEF3: 
message-id=<20211107202739.ce95fab...@nantes-m1.p27.eu>
  postfix/qmgr[3695772]: CE95FABEF3: from=<>, size=5839, nrcpt=1 (queue active)
  postfix/bounce[3889981]: A0BCEA0FEB: sender non-delivery notification: 
CE95FABEF3
  postfix/qmgr[3695772]: A0BCEA0FEB: removed
  postfix/smtpd[3889975]: disconnect from 
mail-pg1-f171.google.com[209.85.215.171] ehlo=2 starttls=1 mail=1 rcpt=1 bdat=1 
quit=1 commands=7
  postfix/smtp[3889983]: CE95FABEF3: to=<j...@example.com>, 
relay=aspmx.l.google.com[64.233.165.26]:25, delay=1.2, delays=0/0.02/0.25/0.9, 
dsn=2.0.0, status=sent (250 2.0.0 OK  1636316860 bn9si33625175ljb.258 - gsmtp)
  postfix/qmgr[3695772]: CE95FABEF3: removed

The key line there seems to be this:

    to=<jeff...@p27.eu>, relay=dovecot, delay=0.2, delays=0.18/0.01/0/0.02, 
dsn=5.1.1, status=bounced (user unknown)

There is, indeed, a line in /etc/dovecot/conf.d/15-lda:

    recipient_delimiter = +

which I just uncommented.  But after bouncing dovecat (and postfix,
for good measure), the log says about the seame thing as before.

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