diff --git a/install_postfix_base.sh b/install_postfix_base.sh
index 38617d4..1d305bd 100755
--- a/install_postfix_base.sh
+++ b/install_postfix_base.sh
@@ -674,12 +674,25 @@ mydestination =
 ## -
 mynetworks = 
    127.0.0.0/8
-   ${IPV4}/32
+EOF
 
-smtp_bind_address = $IPV4
-smtp_bind_address6 = $IPV6
+   if [[ ${IPV4} =~ ^127 ]] ; then
+
+      cat <<EOF >> /etc/postfix/main.cf
+
+smtp_bind_address =
+smtp_bind_address6 =
 
 EOF
+   else
+      cat <<EOF >> /etc/postfix/main.cf
+      ${IPV4}/32
+
+smtp_bind_address = $IPV4
+#smtp_bind_address6 =
+
+EOF
+   fi
 fi
 
 cat <<EOF >> /etc/postfix/main.cf