[QAT] 352970: 4x leftovers

[Ports-QAT]

Update to new upstream version 2.1.18.

Bugfixes, DMARC policy support.
New dependency on py-dnspython.

Upstream change log:
https://mail.python.org/pipermail/mailman-announce/2014-May/000193.html
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  Build ID:          20140504204600-60400
  Job owner:         mandree at FreeBSD.org
  Buildtime:         7 minutes
  Enddate:           Sun, 04 May 2014 20:53:25 GMT

  Revision:          352970
  Repository:        https://svnweb.freebsd.org/ports?view=revision&revision=352970

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    Port:            mail/mailman 2.1.18

      Buildgroup:     8.4-QAT/amd64
      Buildstatus:   LEFTOVERS
      Log: https://qat.redports.org//~mandree@FreeBSD.org/20140504204600-60400-325798/mailman-2.1.18.log

      Buildgroup:     8.4-QAT/i386
      Buildstatus:   LEFTOVERS
      Log: https://qat.redports.org//~mandree@FreeBSD.org/20140504204600-60400-325799/mailman-2.1.18.log

      Buildgroup:     9.2-QAT/amd64
      Buildstatus:   LEFTOVERS
      Log: https://qat.redports.org//~mandree@FreeBSD.org/20140504204600-60400-325800/mailman-2.1.18.log

      Buildgroup:     9.2-QAT/i386
      Buildstatus:   LEFTOVERS
      Log: https://qat.redports.org//~mandree@FreeBSD.org/20140504204600-60400-325801/mailman-2.1.18.log


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