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