check_local_mail

#!/bin/sh
# check mailspool for local mail. If we find any flag it as a critical
# note: the nagios user (which runs this script) should not be able to
#       read mail. sudo is your friend

# location mail builds up in and needs checking
mailspool=/var/mail

# sanity checks
###############################################
if [ ! -d "$mailspool" ];then
  echo "Mailspool not present at $mailspool"
  exit 3
fi

cd $mailspool 2>/dev/null
if [ "$?" -ne 0 ];then
  echo "Can't access mailspool '$mailspool'"
  exit 3
fi
###############################################


# check file lengths to see if any contain mail
for mailfile in *
do
  if [ -s "$mailfile" ];then
    bigfiles="$bigfiles : $mailfile"
  fi
done


# print the required naigos exits based on results.
if [ -z "$bigfiles" ];then
  echo "OK - No mail found."
  exit 0
else
  echo "Critical: Mail found in $bigfiles"
  exit 2
fi