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-rw-r--r--Mailman/Handlers/CookHeaders.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Mailman/Handlers/CookHeaders.py b/Mailman/Handlers/CookHeaders.py
index 43c338bb3..60a344285 100644
--- a/Mailman/Handlers/CookHeaders.py
+++ b/Mailman/Handlers/CookHeaders.py
@@ -89,7 +89,7 @@ def process(mlist, msg, msgdata):
#
# http://www.dsv.su.se/~jpalme/ietf/mail-attributes.html
#
- if not msg.get('list-id'):
+ if not msg.get('list-id') and not msgdata.get('_nolist'):
msg['List-Id'] = mlist.GetListIdentifier()
#
# These currently seem like overkill. Maybe add them in later when