On Thursday, April 7, 2022, 07:23:14 PM GMT+2, Wietse Venema
<wie...@porcupine.org> wrote:>>Pedro David Marco:>>> Hi,>> Postfix
documentation about smtp_fallback_relay says:>>>> smtp_fallback_relay (default:
$fallback_relay):>> Optional list of relay hosts for SMTP destinations that
can't>> be found or that are unreachable. With Postfix 2.2 and earlier>> this
parameter is called fallback_relay.>>>> I have destinations not accepting email
with a 451 return code.>> Some of them are being sent by postfix to the
smtp_fallback_relay>> and some of them are just sent to the deferred queue...
Probably>> i am misunderstanding Postfix documentation but... What is exactly>>
the Postfix criteria about using smtp_fallback_relay ????>>>>If the mail stays
in the Postfix queue, then the smtp_fallback_relay>was not available, or it
rejected the mail with a 4XX status, or>you restarted Postfix while it was
delivering mail.>>You can see that with some logfile analysis.>> Wietse>
Thanks Wietse,
that is my understanding but no one restarted Postfix...
smtp_fallback_relay only applies when destination is not found or unreachable.
"Unreachable" meansthat Postfix cannot connect to the remote TCP port, am i
right?
A 4XY status means the destination "is reachable", so mail should always be
deferred, is this correct?
Sorry, but i am confused... documentation is accurate, but probably not my
understading of it...
Thanks,
Pete.
