diff --git a/plugins/postfix/postfix-rbl-blocked-mails b/plugins/postfix/postfix-rbl-blocked-mails
index beb78b4e..cfb525b6 100755
--- a/plugins/postfix/postfix-rbl-blocked-mails
+++ b/plugins/postfix/postfix-rbl-blocked-mails
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 #
 # Made by Stefan Bühler, Switzerland
 # Monitor blocked Mails during Postfix RBL Scan, included Spamhaus, Spamcop, Manitu, MSRBL, NJABL
@@ -6,8 +6,7 @@
 
 # Allow user to specify logfile through env.logfile
 LOGFILE=${logfile:-/var/log/mail.log}
-DATE=`date '+%b %e %H'`
-MAXLABEL=20
+DATE=$(date '+%b %e %H')
 
 
 get_blocked_by_domain_count() {