update to 3.4.1:

    - improved automation to help combat spammers that are abusing
      new top level domains;
    - tweaks to the SPF support to block more spoofed emails;
    - increased character set normalization to make rules easier to
      develop and stop spammers from using alternate character sets
      to bypass tests;
    - continued refinement to the native IPv6 support; and
    - improved Bayesian classification with better debugging and
      attachment hashing.

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