[MM3-users] Re: cc'd e-mail addresses rewritten with @invalid.domain

Hi Mailman Users,

I apologize for sending multiple messages! I wanted to mention that this issue occurs whether or not the user with the malformed cc is a member of the list in question. I also noticed that the issues seem to be only happening with the addresses in quotes, and wondered if this snippet of code in avoid_duplicates.py gives any hints as to what the issues may be?

    # We've seen messages with Cc: headers folded inside a quoted string.
    # I.e., a message composed with several Cc addresses of the form
    # 'real name (dept) <user@example.com>', the MUA quotes
    # "real name (dept)" and then folds the header between 'name' and
    # '(dept)' resulting in a header including the entry
    # '"real name\r\n (dept)" <user@example.com>' which parses incorrectly,
    # so we "unfold" headers here.
    for header in ('to', 'cc', 'resent-to', 'resent-cc'):
        hdrs_unfolded = [re.sub('[\r\n]', '', value) for value in
                         msg.get_all(header, [])]
        addrs = getaddresses(hdrs_unfolded)
        header_addresses = dict((addr, formataddr((name, addr)))
                                for name, addr in addrs
                                if addr)

Thanks again and have a nice day! Peter