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-rw-r--r--Mailman/Handlers/Cleanse.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/Mailman/Handlers/Cleanse.py b/Mailman/Handlers/Cleanse.py
index d84f988e3..05d8b5d3b 100644
--- a/Mailman/Handlers/Cleanse.py
+++ b/Mailman/Handlers/Cleanse.py
@@ -54,3 +54,5 @@ def process(mlist, msg, msgdata):
del msg['x-confirm-reading-to']
# Pegasus mail uses this one... sigh
del msg['x-pmrqc']
+ # Don't let this header be spoofed. See RFC 5064.
+ del msg['archived-at']