Insert

src/freedombone-addemail

         echo "# End of rule" >> $PM
     else
         filter=$(echo "# Email rule for $EMAILADDRESS -> $GROUP_NAME\n:0\n  * ^From:.*$EMAILADDRESS\n$LISTDIR/new\n# End of rule\n")
-        sed "/# encrypt/i ${filter}" $PM
+        sed -i "/# encrypt/i ${filter}" $PM
     fi
     chown $MYUSERNAME:$MYUSERNAME $PM
 fi

src/freedombone-addlist

         echo "$filter" >> $PM
     else
         filter=$(echo "# Email rule for $MAILINGLIST subject [$SUBJECTTAG]\n:0\n  * ^Subject:.*()\\\[$SUBJECTTAG\\\]\n$LISTDIR/new\n# End of rule\n")
-        sed "/# encrypt/i ${filter}" $PM
+        sed -i "/# encrypt/i ${filter}" $PM
     fi
     chown $MYUSERNAME:$MYUSERNAME $PM
 fi