diff --git a/contrib/testing/smtp-relayhost-check.py b/contrib/testing/smtp-relayhost-check.py
index 8e64b0c..9815d80 100755
--- a/contrib/testing/smtp-relayhost-check.py
+++ b/contrib/testing/smtp-relayhost-check.py
@@ -191,6 +191,15 @@ def perform_test() -> None:
     if os.geteuid() != 0:
         raise SMTP09Error("the live relayhost test must run as root")
     original = SMTP07.read_smtp_configuration()
+    configured_host = str(
+        original.get("internal_relay_bind_address", "")
+    ).strip()
+    if configured_host in {"", "0.0.0.0", "::"}:
+        configured_host = "127.0.0.1"
+    SMTP07.INTERNAL_HOST = configured_host
+    SMTP07.INTERNAL_PORT = int(
+        original.get("internal_relay_port", SMTP07.INTERNAL_PORT)
+    )
     originally_active = SMTP07.service_active()
     if not originally_active:
         raise SMTP09Error("bongo.service must be active before this live test")