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/usr/share/doc/procmail/examples/3procmailrc is in procmail 3.22-25+deb9u1.

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# Please check if all the paths in PATH are reachable, remove the ones that
# are not.

PATH=$HOME/bin:/usr/bin:/global/bin:/usr/ucb:/bin:/usr/local/bin:
MAILDIR =	$HOME/Mail	# You'd better make sure it exists
DEFAULT =	$MAILDIR/mbox
LOGFILE =	$MAILDIR/from
LOCKFILE=	$HOME/.lockmail

			# This will create a local lockfile named todd.lock
:0:			# *if* the condition matches
* ^From.*thf
todd

LOCKFILE=$MAILDIR/whatever	# This will remove the global lockfile
				# $HOME/.lockmail and the new lockfile
				# will be $MAILDIR/whatever


				# The next recipe will
				# filter out all messages from "at"
				# jobs and will put them in a terse format
				# (only the date and the body) in
				# a file called $MAILDIR/atjunk
:0 fh
* ^From root
* ^Subject: Output from "at" job
|egrep "^Date:"
				# The next recipe will only be used if
				# the previous one matched
:0 A
atjunk



MAILDIR=$HOME/News	# This will change the current directory


			# The next recipe will create a local lockfile
			# named $HOME/News/dustbin.lock (*if* the condition
			# matches), and will feed the body of the message
			# through `sort` (sorry, couldn't come up with anything
			# better :-), after which the result will be
			# appended to $HOME/News/dustbin
:0 b:
* ^Subject:.*rubbish
|sort >>dustbin

			# The next recipe will use the games directory as a MH
			# folder (of course you need MH to read the mail then)
:0
* ^Subject:.*games
games/.

# Anything not delivered by now will go to $HOME/Mail/mbox
# Using LOCKFILE=$HOME/Mail/mbox.lock