BIN_DIRECTORY = /usr/exim/bin
  on 

  BIN_DIRECTORY = /usr/local/exim/bin
  Here we specify the installation path Exim executable files. 
 
  CONFIGURE_FILE = /usr/exim/configure
  on 

  CONFIGURE_FILE = /usr /local/exim/configure
  Here we specify the name and path of the configuration file. 
 
  EXIM_USER =
  on 

  EXIM_USER = 1003
  # EXIM_GROUP =
  on 

  EXIM_GROUP = 6
  Remember I talked about the uid and gid?  Right now we need them.  Please enter a numeric user and group IDs on whose behalf will run Exim. 

  SPOOL_DIRECTORY = /var/spool/exim
  on 

  SPOOL_DIRECTORY = /var/spool/mqueue
  Here we specify the name of the spool-directory. 

  # SUPPORT_MAILDIR = yes
  on 

  SUPPORT_MAILDIR = yes
  Here we include support for Maildir. 

  # LOOKUP_MYSQL = yes
  on 

  LOOKUP_MYSQL = yes
  Here we include support for MySQL.