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-rw-r--r--Mailman/versions.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/Mailman/versions.py b/Mailman/versions.py
index 064d67d2..4f31ea77 100644
--- a/Mailman/versions.py
+++ b/Mailman/versions.py
@@ -393,6 +393,7 @@ def NewVars(l):
encode = 2
add_only_if_missing('encode_ascii_prefixes', encode)
add_only_if_missing('news_moderation', 0)
+ add_only_if_missing('header_filter_rules', [])