On Fri, Mar 31, 2023 at 02:00:49PM +0100, Nuno Pereira via Postfix-users wrote:

> Logs of message with success DSN sent:

Are you sure you syslog system is not dropping some of the log messages?
(A common problem with systemd-based logging).

> Mar 31 13:26:19 MAIL01 postfix/lmtp[1444780]: C91CB2217:
>   to=<nuno.pere...@realdomain.com>,
>   relay=mail01.nortenet.pt[private/dovecot-lmtp],
>   delay=3, delays=2.9/0/0/0.07, > dsn=2.0.0,
>   status=sent
>   (250 2.0.0 <nuno.pere...@realdomain.com> CCo8BWvRJmSwGRYAi7tdOA Saved)

> Logs of message with success DSN not sent:
> 
> Mar 31 13:25:43 MAIL01 MailScanner[1402982]: Requeue: E3F7220E5.A2EE1 to
> 048FA228D

Plus you also have MailScanner messing around with your mail.

> Mar 31 13:25:43 MAIL01 postfix/lmtp[1448361]: 048FA228D:
>     to=<nuno.pere...@realdomain.com>,
>     orig_to=<nuno.pere...@virtualdomain.com>,
>     relay=mail01.nortenet.pt[private/dovecot-lmtp],
>     delay=3.2, delays=3.1/0/0/0.06, dsn=2.0.0, status=sent
>     (250 2.0.0 <nuno.pere...@realdomain.com> iPZaA0fRJmSwGRYAi7tdOA Saved)

The second message went through virtual alias rewriting, the first did
not.  The final recipient is not equal to the original recipient.

-- 
    Viktor.
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