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-rw-r--r--Mailman/Defaults.py.in5
1 files changed, 5 insertions, 0 deletions
diff --git a/Mailman/Defaults.py.in b/Mailman/Defaults.py.in
index 545eb6fe..fcf474a5 100644
--- a/Mailman/Defaults.py.in
+++ b/Mailman/Defaults.py.in
@@ -109,6 +109,11 @@ ALLOW_SITE_ADMIN_COOKIES = No
# name of the temporary file that the program should operate on.
HTML_TO_PLAIN_TEXT_COMMAND = '/usr/bin/lynx -dump %(filename)s'
+# A Python regular expression character class which defines the characters
+# allowed in list names. Lists cannot be created with names containing any
+# character that doesn't match this class.
+ACCEPTABLE_LISTNAME_CHARACTERS = '[-+_.=a-z0-9]'
+
#####