Mac OS X Server: Apple-specific postfix options

These are the Apple-specific options for the Postfix main.cf configuration file:

• enable_server_options
  
  Valid options: yes, no
  Set this value to yes if you have set email auto-forwarding for any users who would normally receive mail locally via Work Group Manager.
  
  
• smtpd_use_pw_server
  
  Valid options: yes, no
  Set to yes if using Password Server, otherwise standard open source SASL authentication is used.
  
  
• smtpd_pw_server_security_options
  
  Valid options (one or more): login, plain, cram-md5, gssapi
  Set this option to the desired authentication method(s) you wish to enable for authenticated SMPT relay.  This option is used in conjunction with smtpd_use_pw_server  and is ignored if smtpd_use_pw_server is set to “no�?.