diff --git a/superset/config.py b/superset/config.py
index bd0b298d585e6..4096c70021fb5 100644
--- a/superset/config.py
+++ b/superset/config.py
@@ -1418,6 +1418,7 @@ def EMAIL_HEADER_MUTATOR(  # pylint: disable=invalid-name,unused-argument
         "worker-src": ["'self'", "blob:"],
         "connect-src": [
             "'self'",
+            "https:",
             "https://api.mapbox.com",
             "https://events.mapbox.com",
         ],
@@ -1436,6 +1437,7 @@ def EMAIL_HEADER_MUTATOR(  # pylint: disable=invalid-name,unused-argument
         "worker-src": ["'self'", "blob:"],
         "connect-src": [
             "'self'",
+            "https:",
             "https://api.mapbox.com",
             "https://events.mapbox.com",
         ],