0.4
  - Option for quarantining files with viruses
  - Fixed problem with returning wrong SMTP error code
  - Fixed handling of timeouts
  - 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