diff --git a/tests/test_email.py b/tests/test_email.py
index 3c99b340dead4eb2c1b5f24759e6fe3144035b54..855897ff6ec9d0a9aac068f457cd9ab8dfbbe10b 100755
--- a/tests/test_email.py
+++ b/tests/test_email.py
@@ -158,6 +158,7 @@ def check_send(sender: str) -> tuple:
         # timeout
         timed_out = waited >= timeout
     sys.stdout.write("\n")
+    sys.stdout.flush()
 
     # check if the sending has timed out
     if timed_out: