Matthias Andree:
> Michael Tokarev <mjttls.msk.ru> writes:
>
> > I'm afraid you should change not client's *configuration", but
> > client's *software* that does not understand ESMTP protocol... As
> > long as I understand, RET=HDRS is a DSN option (Delivery Status
> > Notification). Postfix does NOT support it, at all, and does not tell
> > it's client that it support it. According to [E]SMTP, client MUST NOT
> > use an option that isn't available on the server (unless a server
> > especially said it supports an option). Having said this, the
> > solution will be to *fix* client. If you want this to be done in
> > postfix, you're free to modify source, but such a change will make
> > postfix non-standard compliant at best.
>
> Oh, let him donate full DSN-support, but check with Wietse if he would
> accept such code.

As with MIME support, I would not expect anyone to donate it (and
if someone did then I would probably do some serious editing anyway).

        Wietse
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