Ken Smith:
>
> Wietse Venema wrote:
> > {snip}
> >> But senders are not getting DSN's
> > Why should Postfix send those?
> >
> > - What delivery status notifications did a remote SMTP client
> > request in the RCPT TO command?
> >
> > - What delivery status notifications did a local user request
> > with the Postfix sendmail -N command-line option?
> >
> > Wietse
> >
> Incoming message included :-
>
> Disposition-Notification-To: {smtp-address}
>
> Shouldn't that trigger a DSN response?
Disposition-Notification-To is for MUAs (mail USER agents).
Postfix is not a user agent. It is an MTA (mail TRANSFER agent).
https://datatracker.ietf.org/doc/html/rfc3798#section-2
Message disposition notifications are requested by including a
Disposition-Notification-To header in the message. Further
information to be used BY THE RECIPIENT'S MUA in generating the MDN...
https://datatracker.ietf.org/doc/html/rfc3798#section-2.1
The presence of a Disposition-Notification-To header in a message is
merely a request for an MDN. THE RECIPIENTS' USER AGENTS are always
free to silently ignore such a request.
While Internet standards normally do not specify the behavior of user
interfaces, it is strongly recommended THAT THE USER AGENT OBTAIN the
user's consent before sending an MDN.
And so on.
Wietse
