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-rw-r--r--src/mailman/chains/headers.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mailman/chains/headers.py b/src/mailman/chains/headers.py
index 7a77f9f9b..5698740d3 100644
--- a/src/mailman/chains/headers.py
+++ b/src/mailman/chains/headers.py
@@ -96,6 +96,7 @@ class HeaderMatchRule:
def check(self, mlist, msg, msgdata):
"""See `IRule`."""
+ # Collect all the headers in all subparts.
headers = []
for p in msg.walk():
headers.extend(p.get_all(self.header, []))