1.6 [???]
  - On FreeBSD fix problem where stderr wasn't processed when filter
    didn't read stdin.
  - Add strcasestr which is missing on Solaris.

1.5 [2006-09-05]
  - Added support for setting the REMOTE variable when an XFORWARD
    command is seen.

1.4 [2006-08-10]
  - Fix crasher after connection closes unexpectedly.
  - Fix problem with waiting for processes [Jeff Fisher]
  - Better message for 'busy' [Akihiro Sagawa]

1.3 [2005-10-21]
  - Handle condition of server refusing data transfers more gracefully.
  - Less chatty when setting timeouts fail
  - Drop privileges after binding to port. Allows listening on ports < 1024
  - Ported to Solaris
  - Fix problem with binding to certain 'long' addresses
  - Support embedded NULLs in email data.
  - Fix problems with empty addresses in logs.
  - Don't let exchange send it's strange binary data through the proxy
  - Don't reject emails when server is overloaded or errors.
  - Don't reject emails when starting the filter command fails.

1.2.1 [2005-04-15]
  - Fixed bug (introduced in 1.2) when 'Header' option is not present.

1.2  [2005-03-24]
  - Don't leak file descriptors when clamsmtpd can't connect to outgoing
  	SMTP server [Chris Mason]
  - 'Header' configuration option with special format arguments [Olivier Beyssac]
  - Supress weird warnings when looking up names of local unix connections.

1.1  [2005-01-27]
  - Fixed crasher when outgoing connection couldn't be established
  - Removed erroneous chown line from clamsmtpd.sh

1.0  [2004-12-02]
  - Added XCLIENT support.
  - Drop XCLIENT commands coming in from clients for security.
  - Added big scary warnings to the sample scripts about escaping variables.
  - Documentation fixes [Olivier Beyssac]

0.6  [2004-10-30]
  - Added CLIENT and SERVER variables to VirusAction script environment.
  - Even better logging for network errors and filter warnings.
  - Print out proxsmtp version in debug logs
  - Allow configuration of server keep alives (NOOPs). Default to none

0.5  [2004-10-20]
  - Added sample scripts.
  - Initial fork from clamsmtp version 0.9.x
  - Converted into filter based SMTP pass-through