# assuming Slackware Linux
# system users and mbox format

PATH=/bin:/usr/bin:/usr/local/bin
SHELL=/bin/ksh
DROPPRIVS=yes
VERBOSE=no
LOGFILE=$HOME/procmail.log

USER=USERNAME-HERE
ORGMAIL=/var/spool/mail/$USER
DEFAULT=$ORGMAIL
MAILDIR=$HOME/mail

SYSYEAR=`date +%Y`

---

# assuming NetBSD

PATH=/bin:/usr/bin:/usr/local/bin:/usr/pkg/bin

ORGMAIL=/var/mail/$USER

---

#:0
#* !^Received:
#* ^From:.*OTHER@ALTERNATE\.TLD
#${prefix}sent-mail-ALTERNATE

#:0
#* ^(To|Cc):.*OTHER@ALTERNATE\.TLD
#${prefix}ALTERNATE

---

# cron jobs
:0
* ^From:.*(root@|USERNAME@|Cron Daemon|logwatch@)
${prefix}cron

---

# even users have it so cannot enable
#:0
#* ^X-UID:
#.list-ABUSE/

---

#:0
#* ^(List-ID|List-Id)
#{
#       * ^Reply-To: .*<\/([^+@\.>]+)
#       .lists.${MATCH}/
#}

# List-Unsubscribe contains web links unsuitable for folders
# Feedback-ID may contain /
# Unable to treat as directory
# Error while writing to

:0
* ^User-Agent: ZeekControl.*
._cron/