To test a procmail setup (Source: http://lipas.uwasa.fi/~ts/info/proctips.html#start)

checkinteresting.rc

# check if a mail has interesting content for me based on a keyword
# search
SHELL=/bin/sh
PATH="$HOME/bin:/usr/bin:/usr/local/bin:/usr/include:/usr/local/sbin:/bin:/sbin:/usr/sbin"
TESTDIR=/tmp/procmailtest
MAILDIR=${TESTDIR}
LOGFILE=${TESTDIR}/Proctest.log
LOGABSTRACT=all
VERBOSE=yes

# 
# mark my own mails which are not addressed to me as read
# 
# check the body :D -> case insensitive
:0HBfD
* -1^0
* 1^0 ^List-
* 1^0 romanofski
|formail -I"X-Interesting: Yes"

# if the mail is flagged as interesting, deliver it to new and flag it
# with !
:0:
* X-Interesting:.*Yes
{
    # First deliver to maildir so LASTFOLDER gets set
    :0 c
    ${TESTDIR}/

    # Manipulate the filename
    :0 ai
    * LASTFOLDER ?? ()\/[^/]+^^
    |mv "$LASTFOLDER" "${TESTDIR}/new/$MATCH:2,FS"
}
# Hier landen alle restlichen Mails:
:0:
${TESTDIR}/Proctest.mail

procmailtest.sh

#!/bin/bash
# Tests the procmail setup. 
# from: http://lipas.uwasa.fi/~ts/info/proctips.html#start
TESTDIR=/tmp/procmailtest
if [ ! -d ${TESTDIR} ] ; then
  echo "Directory ${TESTDIR} does not exist; First create it"
  exit 0
fi

if [[ "$1" != /* ]]
then
    echo "$1 needs to be an absolute path"
    exit 1
fi

if [[ "$2" = "" ]]
then
    echo "Second parameter should be the mail"
    exit 1
fi

#Feed an email message to procmail. Apply proctest.rc recipes file.
#First prepare a mail.msg email file which you wish to use for the
#testing.
echo "procmail $1 < $2" >> ${TESTDIR}/Proctest.log
procmail $1 < $2
#
#Show the results.
less ${TESTDIR}/Proctest.log
clear
less ${TESTDIR}/Proctest.mail
#
#Clean up.
rm -i ${TESTDIR}/Proctest.log
rm -i ${TESTDIR}/Proctest.mail