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-rwxr-xr-xMailman/Handlers/CookHeaders.py8
1 files changed, 7 insertions, 1 deletions
diff --git a/Mailman/Handlers/CookHeaders.py b/Mailman/Handlers/CookHeaders.py
index 25fda890..63e630cb 100755
--- a/Mailman/Handlers/CookHeaders.py
+++ b/Mailman/Handlers/CookHeaders.py
@@ -380,7 +380,13 @@ def prefix_subject(mlist, msg, msgdata):
else:
old_style = mm_cfg.OLD_STYLE_PREFIXING
subject = re.sub(prefix_pattern, '', subject)
- rematch = re.match('((RE|AW|SV|VS)\s*(\[\d+\])?\s*:\s*)+', subject, re.I)
+ # Previously the following re didn't have the first \s*. It would fail
+ # if the incoming Subject: was like '[prefix] Re: Re: Re:' because of the
+ # leading space after stripping the prefix. It is not known what MUA would
+ # create such a Subject:, but the issue was reported.
+ rematch = re.match(
+ '(\s*(RE|AW|SV|VS)\s*(\[\d+\])?\s*:\s*)+',
+ subject, re.I)
if rematch:
subject = subject[rematch.end():]
recolon = 'Re:'