* Wietse Venema via Postfix-users <postfix-users@postfix.org>:
> Tomas Habarta via Postfix-users:
> > Ralf, looking at the log on one of the servers (Postfix 3.9), I can see 
> > this:
> > 
> > ... smtpd[435179]: NOQUEUE: hold: RCPT from xx[a.b.c.d]: 
> > <i...@example.com>: Sender address triggers HOLD action; 
> > from=<i...@example.com> to=<t...@rcpt.example.com> proto=ESMTP helo=<xx>
> > 
> > You do not have anything similar at all or you find that insufficient?
> 
> Ralf may have been looking for the wrong info.
> 
> The "NOQUEUE" logging indicates that the "hold" action is triggered
> before Postfix has opened a mail transaction.
> 
> - With "smtpd_delay_open_until_valid_rcpt = yes" (the default),
>   Postfix opens a mail transaction after the first valid RCPT TO
>   command.
> 
> - With "smtpd_delay_open_until_valid_rcpt = no", Postfix opens a
>   mail transaction after a valid MAIL FROM command.

Yep, that was the reason why

-- 
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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