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-rw-r--r--Mailman/versions.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/Mailman/versions.py b/Mailman/versions.py
index c7710b18..084a548f 100644
--- a/Mailman/versions.py
+++ b/Mailman/versions.py
@@ -403,6 +403,10 @@ def NewVars(l):
# automatic discard
add_only_if_missing('max_days_to_hold', 0)
add_only_if_missing('nonmember_rejection_notice', '')
+ # multipart/alternative collapse
+ add_only_if_missing('collapse_alternatives',
+ mm_cfg.DEFAULT_COLLAPSE_ALTERNATIVES)
+