> Unfortunately some systems do accept mails and only then notice
> that they can't deliver them, so I have to accept bounces 

We shall also not forget the roots of qpsmtpd. It is a replacement for
qmail-smtpd and qmail is a major example of a MTA which accepts mail
first and then sends bounce messages, of course with <> as envelope
sender.


Regards
Michael

-- 
      It's an insane world, but i'm proud to be a part of it. -- Bill Hicks

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