diff --git a/install_postfix_advanced.sh b/install_postfix_advanced.sh
index 71316d2..0e270b1 100755
--- a/install_postfix_advanced.sh
+++ b/install_postfix_advanced.sh
@@ -3049,7 +3049,7 @@ else
 EOF
 fi
 
-if ${IS_SYMPA_LIST_SERVER} ; then
+if ${IS_SYMPA_LIST_SERVER} || ${IS_RELAY_HOST}; then
 
    cat <<EOF >> /etc/postfix/main.cf