Stefan Bauer:
> Hi,
>
> i would like that postfix always sends DSN, when requested by client and
> mail got forwarded to next-hop / final destination.
Postfix implements a published RFC, and according to that RFC,
Postfix will send a 'relayed' DSN if:
1 - The sender requested DSN notification.
And:
2 - The next-hop MTA does not announce DSN support, or you turn off
DSN support (smtp_discard_ehlo_keywords = dsn, silent-discard).
Additionally, you can tweak the SMTP conversation with
smtpd_command_filter, smtp_reply_filter, and smtp_delivery_status_filter.
There are examples in the documentation of those parameters.
Wietse
