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-rw-r--r--Mailman/Defaults.py.in4
1 files changed, 3 insertions, 1 deletions
diff --git a/Mailman/Defaults.py.in b/Mailman/Defaults.py.in
index bbc63b3e0..0a34cbe16 100644
--- a/Mailman/Defaults.py.in
+++ b/Mailman/Defaults.py.in
@@ -898,7 +898,9 @@ DEFAULT_FILTER_CONTENT = 0
DEFAULT_FILTER_MIME_TYPES = []
# DEFAULT_PASS_MIME_TYPES is a list of MIME types to be passed through. Format is the same as DEFAULT_FILTER_MIME_TYPES
-DEFAULT_PASS_MIME_TYPES = []
+DEFAULT_PASS_MIME_TYPES = ['multipart/mixed',
+ 'multipart/alternative',
+ 'text/plain']
# Whether text/html should be converted to text/plain after content filtering
# is performed. Conversion is done according to HTML_TO_PLAIN_TEXT_COMMAND