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PRELINE(1)		    Double Precision, Inc.		    PRELINE(1)

NAME
       preline - Prepend legacy mbox headers

SYNOPSIS
       /usr/local/bin/preline {program} [arg...]

DESCRIPTION
       preline is a wrapper for program.  preline is usually invoked from
       $HOME/.courier.	preline runs program, together with any additional
       arguments specified on the command line.	 program then receives the
       message being delivered, with some additional headers. The additional
       headers come from the UFLINE, DTLINE, and RPLINE environment variables.
       These environment variables are initialized by courierdeliver, which
       reads and executes commands from $HOME/.courier. These environment
       variables contain additional headers that should be added to every
       message that´s delivered to a local mailbox.

       preline must be used if program, that is executed from $HOME/.courier
       to deliver mail, does not recognize these environment variables.
       UFLINE contains the From_ line, DTLINE contains the Delivered-To:
       header, and RPLINE contains the Return-Path: header. If these headers
       are not present in the message that the program reads, you may end up
       with excessive resources being consumed by mail loops or by
       malfunctioning software which expects to see From_ lines in all
       messages scheduled for local delivery (such as procmail).

EXAMPLE
	   | /usr/local/bin/preline /usr/bin/procmail

       This is the normal way to arrange for procmail to handle local mail
       delivery.

SEE ALSO
       courierpop3d(8)[1], couriertcpd(8)[2], authlib(7)[3].

AUTHOR
       Sam Varshavchik
	   Author

NOTES
	1. courierpop3d(8)
	   [set $man.base.url.for.relative.links]/courierpop3d.html

	2. couriertcpd(8)
	   [set $man.base.url.for.relative.links]/couriertcpd.html

	3. authlib(7)
	   [set $man.base.url.for.relative.links]/authlib.html

Courier Mail Server		  02/10/2011			    PRELINE(1)

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