Josef Karliak via Postfix-users:
> Good morning,
>
> what could cause that Postfix do not send DSN of the mail that is
> recieved over another server ?
1) As specified in RFC 3461, the remote SMTP client may disable
delivery status notifications with:
RCPT TO:<u...@example.com> NOTIFY=none
2) The local Postfix SMTP server can be configured to replace
specific commands. See
https://www.postfix.org/postconf.5.html#smtpd_command_filter
3) The local Postfix server receives the message on a different
port (port 465 or 578) with direct mail, and on port 25 with
indirect mail, and those mail paths receive dofferent treatment.
4) The local Postfix SMTP server receives a different RCPT TO
address with direct mail than with indirect mail.
5) The local Postfix SMTP server is configured to discard the
message depending in how it is received.
6) and so on.
> If I set a email client directly to the the server with Postfix,
> DSN is generated:
How does the Postfix logging differ between these cases?
Wietse
> No DSN : client->smtp1->smtp2
>
> DSN : client->smtp2
>
> Both smtp's IP is in "mynetworks" in the postfix's configuration
>
> What did I missed ?
>
> Thanks and best regards
>
> J.Karliak
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