diff --git a/functions.tf b/functions.tf
index de3a37e67d5f81e4f8bc4b02a2127228a252463d..01ec3e274a57db68a93d51322c2b73b891a72710 100644
--- a/functions.tf
+++ b/functions.tf
@@ -7,6 +7,7 @@ locals {
     "nextcloud",
     "notify",
     "autoconfig",
+    "mta-sta",
   ]
   function_names = [for name in local.functions : "${local.function_name_prefix}-${replace(name, "_", "")}"]
 }
diff --git a/src/mta-sts.py b/src/mta-sts.py
new file mode 100644
index 0000000000000000000000000000000000000000..240fe014ea77ab196f0df344617658eef7191625
--- /dev/null
+++ b/src/mta-sts.py
@@ -0,0 +1,14 @@
+# pylint: disable=invalid-name
+from utils import check_urls
+
+
+def handler(event, context):  # pylint: disable=unused-argument
+    """Lambda event handler."""
+    checks = [
+        {"url": "https://mta-sts.shore.co.il/.well-known/mta-sts.txt"},
+    ]
+    check_urls(checks)
+
+
+if __name__ == "__main__":
+    handler("event", "context")