0.7
  - Added support for ESMTP [Andreas Steinmetz]
  - Fixed crash when too many connections established
  - Announce ourselves as 'clamsmtp' in EHLO/HELO responses which fixes 'loopback'
    problems with certain versions of Postfix 1.x
  - Fixed other minor bugs

0.6
  - Proper adding of customized header [Berk D. Demir]
  - Fixes to documentation [Jasper Slits]

0.5
  - Announce ourselves as 'clamsmtp' in banner to prevent loop warnings
  - Fixed endless loop that occurred on failure to connect out [João Carlos Mendes Luís]
  - Added option for leaving all files in temp directory (debugging purposes)
  - Prints version number when run with -v

0.4
  - Option for quarantining files with viruses
  - Fixed problem with returning wrong SMTP error code
  - Handling timeouts properly
  - Fixed stupid problem with sockets not getting closed properly

0.3
  - Small log format changes
  - When no port specified for out address, connect back to original IP
  - Bug fixes to address parsing and formatting code
  - Fixed problem with AV header not being added [Yamamoto Takao]
  - Send our own initial banner to prevent complaints about loops

0.2
  - Initial public release
  - Sliently dropping viruses is the default
  - Limit to old SMTP (not ESMTP)
  - Added logging
  - Many bug fixes
  - Adds a header to email

0.1
  - Initial implementation