s/qmail:

Section: Misc. Reference Manual Pages (preline)
Updated: 1
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NAME

preline - prepend lines to message

SYNOPSIS

in .qmailext: | preline command

DESCRIPTION

preline feeds each incoming mail message through command. At the top of each message it inserts a UUCP-style From_ line, a Return-Path line, and a Delivered-To line.

preline is useful for procmail and ELM's filter, which do not understand the qmail-command environment variables.

OPTIONS

-d: Do not include the Delivered-To line. You should use this option when the recipient of the incoming mail message is actually under remote control, but was sent here through control/virtualdomains for manual routing.
-f: Do not include the From_ line. You should use this option except for commands that create mbox files.
-r: Do not include the Return-Path line.