**How To Install the Send-Only Mail Server "Exim" on Ubuntu 12.04**

  * sudo apt-get install exim4
  * Configure Exim with the following command:
  * sudo dpkg-reconfigure exim4-config
  * Press the down-arrow key to select mail sent by smarthost; received via SMTP or fetchmail then press Tab, followed by Enter:



''/etc/exim4/update-exim4.conf.conf''
----
  * dc_eximconfig_configtype='local'
  * dc_other_hostnames='monitoring.xxxx.net'
  * dc_local_interfaces='127.0.0.1 ; ::1'
  * dc_readhost='////'
  * dc_relay_domains='////'
  * dc_minimaldns='false'
  * dc_relay_nets='////'
  * dc_smarthost='////'
  * CFILEMODE='644'
  * dc_use_split_config='false'
  * dc_hide_mailname='////'
  * dc_mailname_in_oh='true'
  * dc_localdelivery='mail_spool'

''aptitude install alpine''


''alpine -f /var/spool/mail/system''


https://www.digitalocean.com/community/tutorials/how-to-install-the-send-only-mail-server-exim-on-ubuntu-12-04