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$ exim-config
This script sets some key parameters of the exim
installation and starts the exim daemon.
See the details in /usr/share/doc/Cygwin/exim-X-Y.README.
    Interrupt with ^D.

OK. No usernames contain spaces.

Who is the local postmaster? [ga]
OK. The /etc/aliases file was updated and given mode 0664.
OK. The /etc/aliases file has owner 18 and group 0.

OK. /etc/exim.conf created from /etc/defaults/etc/exim.conf.

Looking for the fully qualified primary hostname.
cygwin warning:
  MS-DOS style path detected: C:/WINDOWS/system32/ping.exe
  Preferred POSIX equivalent is: /cygdrive/c/WINDOWS/system32/ping.exe
  CYGWIN environment variable option "nodosfilewarning" turns off this warning.
  Consult the user's guide for more details about POSIX paths:
"? (yes/no) yes
OK. Exim will autodiscover that name.

INFO: This version of Exim supports ipv6 by default.
      This feature is currently enabled.
Do you want to change that setting? (yes/no) yes
OK. The setting was changed.
OK. The mode and ownership of the /etc/exim.conf file are now:
-rw-rw-r--+ 1 SYSTEM root 36810 Jan  1 16:08 /etc/exim.conf

OK. /usr/bin/exim points to /usr/bin/exim-4.76-1.exe.

INFO: Some programs expect /usr/sbin/sendmail to handle mail.
      Currently it does not exist.
Linking to exim may affect other programs such as cron.
Do you want to link /usr/sbin/sendmail to /usr/bin/exim ? (yes/no) yes
OK. Done.

Do you want to install the exim daemon as a service? (yes/no) yes
Enter the period of the queue runner, in minutes: [15] 0
The period must be positive.
Enter the period of the queue runner, in minutes: [15] 15
Enter the value of CYGWIN for the daemon: [] ntsec

Do you want to start the exim daemon as a service now? (yes/no) yes
OK. The mail daemon is now accepting mail.
    You can test it with "telnet localhost 25".

INFO: The exim log files are in /var/log/exim.

When everything else fails,
    read /usr/share/doc/Cygwin/exim-X-Y.README,
    or look up the documentation on www.exim.org.
Many happy mailings :)