HasExplicitDest(): It is possible that the address part of the tuple

returned by getaddrlist() will return None.  This happens if the
header value is simply not RFC822 compliant.  In that case, ignore
this element.

1 files changed, 5 insertions, 0 deletions

diff --git a/Mailman/MailList.py b/Mailman/MailList.py
index 6f3059a55..609c59d79 100644
--- a/Mailman/MailList.py
+++ b/Mailman/MailList.py
@@ -1205,6 +1205,11 @@ it will not be changed."""),
         for header in ('to', 'cc', 'resent-to', 'resent-cc'):
             to.extend(msg.getaddrlist(header))
         for fullname, addr in to:
+            # It's possible that if the header doesn't have a valid
+            # (i.e. RFC822) value, we'll get None for the address.  So skip
+            # it.
+            if addr is None:
+                continue
             addr = string.lower(addr)
             localpart = string.split(addr, '@')[0]
             if (# TBD: backwards compatibility: deprecated