This is in response to several of the E-mails:

>afaik is the Return-Path: header used to determine where to return the
>mail in case it bounces and other postmaster messages.

That is correct.

>It can very well be some other address than the address where it was
>sent from. Like the reply-to: header.

No.  The Return-Path: header is supposed to include the exact address that 
was used in the "MAIL FROM:" SMTP command (from the "Message Envelope").

 > Uhhh - so this header should (and possibly could) have been set by the
 > originating SMTP server? In other words, that header could/should already
 > exists in the header and Imail should NOT add it upon receipt of inbound
 > mail.

No.  The header is added by the SMTP server that handles the final 
delivery.  So:

 > If ANYTHING, Imail or Declude should add it to any OUTBOUND mail?

It should only be added to *incoming* E-mail.

 > I think it'd be bad practice to set the Return-Path: header when
 > received if not present.

Actually, it is appropriate in this case.  Since IMail should be adding it 
(although technically not required), it's OK for Declude to add it *if* it 
is a local delivery.

 > The from header would be used if there is no Return-Path: header.

The Return-Path: header should NOT be used by an E-mail client for replying 
to E-mail.  That is VERY important.  It should *only* be used for bounces 
and other similar types of messages.

 > And as a note, the preferred headers to set by servers with the envelope
 > to and from addresses are:  Apparently-To: & Apparently-From:

Do you have a source for this?
                             -Scott

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