diff --git a/install_postfix_advanced.sh b/install_postfix_advanced.sh
index 53b1cc7..34e446d 100755
--- a/install_postfix_advanced.sh
+++ b/install_postfix_advanced.sh
@@ -1582,6 +1582,8 @@ mynetworks =
    #162.55.82.73
    # d.mx.oopen.de
    #95.217.204.227/32
+   # e.mx.oopen.de
+   #95.217.204.205/32
 
 smtp_bind_address = $IPV4
 #smtp_bind_address6 = $IPV6
@@ -2472,6 +2474,7 @@ smtpd_relay_restrictions =
 # only special accounts (postmaster, abuse and other rolr accounts)
    check_recipient_access  btree:/etc/postfix/access_recipient-rfc,
 # White- / Blacklisting
+   check_client_access btree:/etc/postfix/client_allow_relay,
    check_sender_access btree:/etc/postfix/access_sender,
    check_recipient_access btree:/etc/postfix/access_recipient,
 # permit trusted network (mynetwork)
@@ -2813,6 +2816,31 @@ else
    echo_failed
 fi
 
+echononl "   Create file \"client_allow_relay\""
+if [[ ! -f "/etc/postfix/client_allow_relay" ]]; then
+   cat <<EOF > /etc/postfix/client_allow_relay
+# /etc/postfix/client_allow_relay
+#
+# Restricts which clients (IP addresses or hostnames) this system accepts
+# (or rejects) for relaying e-mails
+#
+# Example:
+#     b.mx.oopen.de     OK
+
+#lists.mx.warenform.de   OK
+
+#b.mx.oopen.de           OK
+#d.mx.oopen.de           OK
+
+EOF
+fi
+postmap btree:/etc/postfix/client_allow_relay
+if [[ $? -eq 0 ]] ; then
+   echo_ok
+else
+   echo_failed
+fi
+
 echononl "   Create file \"sender_canonical\""
 if [[ ! -f /etc/postfix/sender_canonical ]]; then
 	cat <<EOF > /etc/postfix/sender_canonical