- update to 2.7.0 With a synergy of four solutions, using amavisd-new
  in a pre-queue filtering setup became a sensible / better behaved solution:
  - old helper programs amavis.c and amavis-milter.c are no longer distributed
    with the package, along with the whole helper-progs subdirectory.
    As a milter client please use the more modern 'amavisd-milter' package by
    Petr Rehor, available at http://sourceforge.net/projects/amavisd-milter/
  - the "smtpd_proxy_options=speed_adjust" Postfix option, available since
    Postfix 2.7.0 (20091101), improves decoupling between SMTP clients
    and a content filter in a proxy setup, reducing the number of content
    filtering processes needed for the same mail load. With this option
    turned on, a Postfix SMTP server receives the entire message before
    connecting to a before-queue content filter;
  
  - a master_deadline option and its API equivalent, available in SpamAssassin
    since version 3.3.0, allows for time limiting on lengthy rules checking,
    while still providing results when a time limit is exceeded; this makes
    it more suitable for time-sensitive setups like a pre-queue filtering setup;
  
  - reworked sub-task time limiting in amavisd, along with its counterpart
    solution in SpamAssassin, makes it better suited to a real-time nature
    of pre-queue filtering setups, where one has no control over how long
    SMTP clients are willing to wait at the data-end stage;
  
  - a re-purposed command line option 'reload' now does a warm restart,
    keeping sockets available to an MTA client at all times, thus reducing
    a chance that an MTA would even notice a content filter's warm restart.

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