MailList.HasExplicitDest(): Protect use of user-supplied regexp. If

  the regexp specifying a list alias doesn't compile, match against
  the re.escape(invalid_regexp) instead.
MailList.parse_matching_header_opt(): Only return triples having
  compileable regexps.  If some line in `bounce_matching_headers'
  results in an invalid regexp, this is logged and ignored (possibly a
  lot of times, until the misconfiguration is fixed).
  Also, the re.split() on the lines in `bounce_matching_headers' is
  now called with third arg `maxsplit' set to 1 to avoid splitting the
  header lines more than once.  I don't have any Python prior to 1.5.1
  handy, but my copy of the Library Reference states that this
  argument was ignored in the original 1.5 release -- implying that it
  existed.

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