0.6
  - Proper adding of customized header [Berk D. Bemir]
  - 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