F=P
Need Return-Path: in header All versions
The F=P
delivery
agent flag is used by
sendmail.cf header commands
to force the inclusion of return-path
information:
H?P?Return-Path: <$g>
The F=P
delivery
agent flag has no special internal meaning to
sendmail. It is a convention
that is used only in the assorted Return-Path
: (Return-Path: on page 1165) header
definitions. See F= on page
743 for a general description of this
process.
The sender’s envelope address (the address that would
be used to return mail if it were bounced, for
example) is placed into $g
for use in the Return-Path
: header
line. This is usually done during final delivery,
although it can also be done for delivery agents
that lack a clear envelope address. The form of the
address in the $g
sendmail macro ($g on page 824) depends on the
setting of the F=p
delivery agent flag. Note that this
is normally the same as the address in the five
character "From
"
line.
This F=P
flag
should be used only with delivery agents that
perform final delivery (such as local
, prog
, and *file*
) and which do not
add their own Return-Path
: header. This F=P
flag should not be
used for any delivery agent that delivers using
SMTP.
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