Re: QMQP, QSBMF, RFC-1894 and MIME (was: QMQP may eat your mail and its bounces)

[Bruno Wolff III]

On Sun, Sep 09, 2001 at 03:59:16PM +0200,
  Pavel Kankovsky <[EMAIL PROTECTED]> wrote:
> 
> On Fri, 7 Sep 2001, Bruno Wolff III wrote:
> 
> > Bounces have empty envelope sender addresses. That is the only
> > characteristic that should be used to identify them.
> 
> You are both right and wrong. You are right because bounces have empty
> envelope senders aka return paths...or are supposed to have according
> to the RFCs. You are wrong because the *format* of bounces should be
> recognizable even after manipulation that do not preserve envelope
> senders--imagine a user forwarding a bounce to his/her postmaster.

If you forward the message on, it may or may not still be a bounce
message. The envelope sender address should be still used to indicate
whether or not the message is still a bounce message or a normal message
whose contents are a bounce message.