The qmail FAQ gives this command:
In /.qmail add the line
| preline procmail
Version 3.11pre7 has changed the default mail box variable. It used to be in config.h. It is now in src/authenticate.c:
#define MAILSPOOLHOME "/Mailbox" /* watch the leading / */
/* delivers to $HOME/Mailbox */
I have culled from comp.mail.mh ans comp.mail.misc some hints on a .procmailrc file. Thanks to everyone!
# A SAMPLE .PROCMAILRC FILE FOR NOVICES
# Written by Catherine Hampton <ariel@best.com>
# Version 1.1
# Updated 1/25/98
#
# Released to the Public Domain.
#
#
# SET VARIABLES
# Internal Variables
# the following have be modified by rdn 19980303
# Everyone says that the SHELL environment is essential
SHELL=/bin/sh #Shell used to run procmail. Be sure this points to
#your system's copy of sh. DO NOT substitute a
#different shell unless you really know UNIX
LINEBUF=4096 #Needed to keep Procmail from choking on long
#"recipes", or instructions on what to do with
#particular kinds of email.
PATH=$HOME/bin:/bin:/usr/bin:/usr/local/bin:/usr/bin/mh:/usr/lib/mh:
#Path for your programs -- this is probably best
#left alone.
VERBOSE=off #Change this to "on" when you try a new recipe
#so that Procmail will log literally every step
#it takes. DO NOT LEAVE IT ON, though, because
#it creates huge logfiles.
# Default Program & file locations
MAILDIR=$HOME/Mail #you'd better make sure this directory exists
DEFAULT=$HOME/Mailbox #default incoming mailbox for shell2-5 users
#on Best Internet. Substitute the correct
#setting for your system.
LOGFILE=$MAILDIR/procmail.log #Logs message disposition. Recommended -- otherwise
#errors are emailed to you. :/
FORMAIL=/usr/bin/formail #useful for autoreply recipes. If you
#are not on Best Internet, modify this to
#your system's copy of formail.
SENDMAIL=/usr/sbin/sendmail #useful for autoreply recipes. If you are
#not on Best Internet, modify this to point
#to your system's copy of sendmail.
Procmail is an excellently documented program. Read the man pages for examples on how to set up your .procmailrc file.