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-rw-r--r--Mailman/Queue/CommandRunner.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Mailman/Queue/CommandRunner.py b/Mailman/Queue/CommandRunner.py
index e4ece34b9..461347581 100644
--- a/Mailman/Queue/CommandRunner.py
+++ b/Mailman/Queue/CommandRunner.py
@@ -122,7 +122,7 @@ class CommandRunner(Runner):
else:
senderlhs = sender
if senderlhs in mm_cfg.LIKELY_BOUNCE_SENDERS:
- syslog('error', 'bounce loop detected from: %s' % sender)
+ syslog('error', 'bounce loop detected from: %s', sender)
return
# Any messages to the owner address must have Errors-To: set
# back to the owners address so bounce loops can be broken, as