add mail check

check_mail_eklig.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+MAILDIR=/home/mailtest/mail
+PERSISTENCE_FILE=/tmp/mailnum
+
+cur_num=$(find $MAILDIR -type f | wc -l)
+prev_num=$(cat $PERSISTENCE_FILE)
+
+EXITCODE=3
+STATUS=UNKNOWN
+
+if [ $cur_num -gt $prev_num ]; then
+    EXITCODE=0
+    STATUS="OK: increasing"
+else
+    EXITCODE=1
+    STATUS="CRITICAL: not increasing"
+fi
+
+echo $cur_num > $PERSISTENCE_FILE
+
+performance="mails:$cur_num"
+
+print "$STATUS | $performance"
+exit $EXITCODE
+