Updated postfix to 2.0.20

- The postdrop mail submission command could die with SIGHUP and
  abort mail submission.  This was observed with mail from cron jobs.

- The MySQL client aborted with complaints about multiple attempts
  to register the same lookup table. This was observed in the proxymap
  daemon.

- As a workaround for agressive SMTP command pipelining clients,
  the Postfix SMTP server now allows SMTP clients to overshoot the
  SMTP server recipient limit without triggering the server hard
  error limit, as long as the number of excess recipients stays within
  a hard-coded overshoot limit of 1000. If you have such clients then
  you also need to specify "smtpd_error_sleep_time = 0" or else
  performance will be poor.

- The LMTP client attempted to reuse a connection after timeout,
  causing protocol synchronization errors.

- The trivial-rewrite server could core dump after temporary table
  lookup failure.  This was not observed in Postfix 2.0.

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